theme changed

2025-09-30 08:21:09 +03:00
parent 4c261f7def
commit 8bd93df2ae
917 changed files with 15023 additions and 0 deletions
--- a/labs/lab8/MyClass/Book.cs
+++ b/labs/lab8/MyClass/Book.cs
@@ -0,0 +1,77 @@
+using System;
+
+class Book : Item
+{
+    private String author;
+    private String title;
+    private String publisher;
+    private int pages;
+    private int year;
+    private bool returnSrok;
+
+    private static double price = 9;
+
+    static Book()
+    {
+        price = 10;
+    }
+
+    public Book()
+    {
+
+    }
+
+
+    public Book(String author, String title, String publisher, int pages, int year, long invNumber, bool taken) : base (invNumber, taken)
+    {
+        this.author = author;
+        this.title = title;
+        this.publisher = publisher;
+        this.pages = pages;
+        this.year = year;
+    }
+
+    public Book(String author, String title)
+    {
+        this.author = author;
+        this.title = title;
+    }
+
+    public void SetBook(String author, String title, String publisher, int pages, int year)
+    {
+        this.author = author;
+        this.title = title;
+        this.publisher = publisher;
+        this.pages = pages;
+        this.year = year;
+    }
+
+    public static void SetPrice(double price)
+    {
+        Book.price = price;
+    }
+
+
+    public override void Show()
+    {
+        Console.WriteLine("\nКнига:\n Автор: {0}\n Название: {1}\n Год издания: {2}\n {3} стр.\n Стоимость аренды: {4}", author, title, year, pages, Book.price);
+        base.Show();
+    }
+
+
+    public double PriceBook(int s)
+    {
+        double cost = s * price;
+        return cost;
+    }
+
+    public void ReturnSrok()
+    {
+        returnSrok = true;
+    }
+
+    public override void Return()
+    {
+        taken = returnSrok;
+    }
+}
--- a/labs/lab8/MyClass/IPubs.cs
+++ b/labs/lab8/MyClass/IPubs.cs
@@ -0,0 +1,7 @@
+using System;
+
+interface IPubs
+{
+    void Subs();
+    bool IfSubs { get; set; }
+}
--- a/labs/lab8/MyClass/Item.cs
+++ b/labs/lab8/MyClass/Item.cs
@@ -0,0 +1,55 @@
+using System; 
+
+abstract class Item : IComparable
+{
+    protected long invNumber;
+    protected bool taken;
+
+    public Item(long invNumber, bool taken)
+    {
+        this.invNumber = invNumber;
+        this.taken = taken;
+    }
+
+    public Item()
+    {
+        this.taken = true;
+    }
+
+    public bool IsAvailable()
+    {
+        return taken;
+    }
+
+    public long GetInvNumber()
+    {
+        return invNumber;
+    }
+
+    private void Take()
+    {
+        taken = false;
+    }
+
+    public void TakeItem()
+    {
+        if (this.IsAvailable())
+            this.Take();
+    }
+
+
+    abstract public void Return();
+
+    public virtual void Show()
+    {
+        Console.WriteLine("Состояние единицы хранения:\n Инвентарный номер: {0}\n Наличие: {1}", invNumber, taken);
+    }
+
+    int IComparable.CompareTo(object obj)
+    {
+        Item it = (Item)obj;
+        if (this.invNumber == it.invNumber) return 0;
+        else if (this.invNumber > it.invNumber) return 1;
+        else return -1;
+    }
+}
--- a/labs/lab8/MyClass/Magazine.cs
+++ b/labs/lab8/MyClass/Magazine.cs
@@ -0,0 +1,40 @@
+using System;
+
+class Magazine : Item, IPubs
+{
+    private String volume;
+    private int number;
+    private String title;
+    private int year;
+
+    public Magazine(String volume, int number, String title, int year, long invNumber, bool taken) : base(invNumber, taken)
+    {
+        this.volume = volume;
+        this.number = number;
+        this.title = title;
+        this.year = year;
+    }
+
+    public Magazine()
+    {}
+
+    public override void Show()
+    {
+        Console.WriteLine("\nЖурнал:\n Том: {0}\n Номер: {1}\n Название: {2}\n Год выпуска: {3}", volume, number, title, year);
+        base.Show();
+    }
+
+
+    public override void Return()
+    {
+        taken = true;
+    }
+
+    public bool IfSubs { get; set; }
+
+    public void Subs()
+    {
+        Console.WriteLine("Подписка на журнал \"{0}\": {1}.", title, IfSubs);
+    }
+
+}
--- a/labs/lab8/MyClass/MyClass.csproj
+++ b/labs/lab8/MyClass/MyClass.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
--- a/labs/lab8/MyClass/Program.cs
+++ b/labs/lab8/MyClass/Program.cs
@@ -0,0 +1,77 @@
+using System;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        Book b1 = new Book();
+        b1.SetBook("Пушкин А.С.", "Капитанская дочка", "Вильямс", 123, 2012);
+        Book.SetPrice(12);
+        b1.Show();
+        Console.WriteLine("\n Итоговая стоимость аренды: {0} р.", b1.PriceBook(3));
+
+        // Book b2 = new Book("Толстой Л.Н.", "Война и мир", "Наука и жизнь", 1234, 2013);
+        // b2.Show();
+
+        Book b3 = new Book("Лермонтов М.Ю.", "Мцыри");
+        b3.Show();
+
+
+        Triangle t1 = new Triangle(3, 4, 5);
+        t1.Show();
+        Console.WriteLine("perimeter = {0}", t1.Perimeter());
+        Console.WriteLine("area = {0}", t1.Area());
+        Console.WriteLine("does this triangle exist? {0}", t1.Exists());
+
+        Triangle t2 = new Triangle(3, 4, 7);
+        t2.Show();
+        Console.WriteLine("does this triangle exist? {0}", t2.Exists());
+
+        // Item item1 = new Item();
+        // item1.Show();
+
+        Book b2 = new Book("Толстой Л. Н.", "Война и мир", "Наука и жизнь", 1234, 2013, 101, true);
+
+        b2.Show();
+        b2.TakeItem();
+        b2.Show();
+
+
+        // Magazine mag1 = new Magazine("О природе", 5, "Земля и мы", 2014, 1235, true);
+        // mag1.Show();
+
+        Console.WriteLine("\n Тестирование полиформизма");
+        Item it;
+
+        it = b2;
+        it.TakeItem();
+        it.Return();
+        it.Show();
+
+        // it = mag1;
+        // it.TakeItem();
+        // it.Return();
+        // it.Show();
+
+
+        Magazine mag1 = new Magazine("О природе", 5, "Земля и мы", 2014, 1235, true);
+        mag1.TakeItem();
+        mag1.Show();
+        mag1.IfSubs = true;
+        mag1.Subs();
+
+        Item[] items = new Item[4];
+        items[0] = b1;
+        items[1] = b2;
+        items[2] = b3;
+        items[3] = mag1;
+
+        Array.Sort(items);
+
+        Console.WriteLine("\nСортировка по инвентарному номеру");
+        foreach (Item x in items)
+        {
+            x.Show();
+        }
+    }
+}
--- a/labs/lab8/MyClass/Triangle.cs
+++ b/labs/lab8/MyClass/Triangle.cs
@@ -0,0 +1,42 @@
+using System;
+
+class Triangle
+{
+    private int a;
+    private int b;
+    private int c;
+
+    public Triangle(int a, int b, int c)
+    {
+        this.a = a;
+        this.b = b;
+        this.c = c;
+    }
+
+    public void Show()
+    {
+        Console.WriteLine("a: {0}\nb: {1}\nc: {2}", a, b, c);
+    }
+
+    public int Perimeter()
+    {
+        return a + b + c;
+    }
+
+    public double Area()
+    {
+        double p = Perimeter() / 2;
+        return Math.Sqrt(p * (p - a) * (p - b) * (p - c));
+    }
+
+    public bool Exists()
+    {
+        if (a <= 0 || b <= 0 || c <= 0) return false;
+
+        double maxSide = Math.Max(Math.Max(a, b), Math.Max(b, c));
+
+        if (maxSide >= a + b + c - maxSide) return false;
+
+        return true;
+    }
+}
--- a/labs/lab8/MyClass/bin/Debug/net9.0/MyClass
+++ b/labs/lab8/MyClass/bin/Debug/net9.0/MyClass
--- a/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.deps.json
+++ b/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.deps.json
@@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v9.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v9.0": {
+      "MyClass/1.0.0": {
+        "runtime": {
+          "MyClass.dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "MyClass/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}
--- a/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.dll
+++ b/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.dll
--- a/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.pdb
+++ b/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.pdb
--- a/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.runtimeconfig.json
+++ b/labs/lab8/MyClass/bin/Debug/net9.0/MyClass.runtimeconfig.json
@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}
--- a/labs/lab8/MyClass/obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v9.0", FrameworkDisplayName = ".NET 9.0")]
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfo.cs
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfo.cs
@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("MyClass")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+7c0cae85247e714f121496e471ff040abcdf0f0f")]
+[assembly: System.Reflection.AssemblyProductAttribute("MyClass")]
+[assembly: System.Reflection.AssemblyTitleAttribute("MyClass")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfoInputs.cache
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+669a34a9348f9959205ed831232c26c89da1c15b8353ab4f15cece73f33f2362
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.GeneratedMSBuildEditorConfig.editorconfig
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.GeneratedMSBuildEditorConfig.editorconfig
@@ -0,0 +1,15 @@
+is_global = true
+build_property.TargetFramework = net9.0
+build_property.TargetPlatformMinVersion = 
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = MyClass
+build_property.ProjectDir = /home/nik/oop/labs/lab8/MyClass/
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.EffectiveAnalysisLevelStyle = 9.0
+build_property.EnableCodeStyleSeverity = 
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.GlobalUsings.g.cs
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.GlobalUsings.g.cs
@@ -0,0 +1,8 @@
+// <auto-generated/>
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.assets.cache
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.assets.cache
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.csproj.CoreCompileInputs.cache
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+549f035e7c10aa5d3bdedf5cf21c6bd1a86b89787560e5ea468865b9de0207aa
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.csproj.FileListAbsolute.txt
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.csproj.FileListAbsolute.txt
@@ -0,0 +1,28 @@
+/home/nik/oop/labs/lab7/MyClass/bin/Debug/net9.0/MyClass
+/home/nik/oop/labs/lab7/MyClass/bin/Debug/net9.0/MyClass.deps.json
+/home/nik/oop/labs/lab7/MyClass/bin/Debug/net9.0/MyClass.runtimeconfig.json
+/home/nik/oop/labs/lab7/MyClass/bin/Debug/net9.0/MyClass.dll
+/home/nik/oop/labs/lab7/MyClass/bin/Debug/net9.0/MyClass.pdb
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/MyClass.GeneratedMSBuildEditorConfig.editorconfig
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfoInputs.cache
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/MyClass.AssemblyInfo.cs
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/MyClass.csproj.CoreCompileInputs.cache
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/MyClass.dll
+/home/nik/oop/labs/lab7/MyClass/obj/Debug/net9.0/refint/MyClass.dll
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+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.csproj.CoreCompileInputs.cache
+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.dll
+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/refint/MyClass.dll
+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.pdb
+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.genruntimeconfig.cache
+/home/nik/oop/labs/lab8/MyClass/obj/Debug/net9.0/ref/MyClass.dll
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.dll
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.dll
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.genruntimeconfig.cache
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.genruntimeconfig.cache
@@ -0,0 +1 @@
+05e67916dc7e7a166b007425dfb5bd2109a5154d4b7f928392676054c8729ea4
--- a/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.pdb
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/MyClass.pdb
--- a/labs/lab8/MyClass/obj/Debug/net9.0/apphost
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/apphost
--- a/labs/lab8/MyClass/obj/Debug/net9.0/ref/MyClass.dll
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/ref/MyClass.dll
--- a/labs/lab8/MyClass/obj/Debug/net9.0/refint/MyClass.dll
+++ b/labs/lab8/MyClass/obj/Debug/net9.0/refint/MyClass.dll
--- a/labs/lab8/MyClass/obj/MyClass.csproj.nuget.dgspec.json
+++ b/labs/lab8/MyClass/obj/MyClass.csproj.nuget.dgspec.json
@@ -0,0 +1,73 @@
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+  "restore": {
+    "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj": {}
+  },
+  "projects": {
+    "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj": {
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+      "restore": {
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+        "projectName": "MyClass",
+        "projectPath": "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj",
+        "packagesPath": "/home/nik/.nuget/packages/",
+        "outputPath": "/home/nik/oop/labs/lab8/MyClass/obj/",
+        "projectStyle": "PackageReference",
+        "configFilePaths": [
+          "/home/nik/.nuget/NuGet/NuGet.Config"
+        ],
+        "originalTargetFrameworks": [
+          "net9.0"
+        ],
+        "sources": {
+          "https://api.nuget.org/v3/index.json": {}
+        },
+        "frameworks": {
+          "net9.0": {
+            "targetAlias": "net9.0",
+            "projectReferences": {}
+          }
+        },
+        "warningProperties": {
+          "warnAsError": [
+            "NU1605"
+          ]
+        },
+        "restoreAuditProperties": {
+          "enableAudit": "true",
+          "auditLevel": "low",
+          "auditMode": "direct"
+        },
+        "SdkAnalysisLevel": "9.0.100"
+      },
+      "frameworks": {
+        "net9.0": {
+          "targetAlias": "net9.0",
+          "imports": [
+            "net461",
+            "net462",
+            "net47",
+            "net471",
+            "net472",
+            "net48",
+            "net481"
+          ],
+          "assetTargetFallback": true,
+          "warn": true,
+          "downloadDependencies": [
+            {
+              "name": "Microsoft.AspNetCore.App.Ref",
+              "version": "[9.0.9, 9.0.9]"
+            }
+          ],
+          "frameworkReferences": {
+            "Microsoft.NETCore.App": {
+              "privateAssets": "all"
+            }
+          },
+          "runtimeIdentifierGraphPath": "/usr/share/dotnet/sdk/9.0.110/PortableRuntimeIdentifierGraph.json"
+        }
+      }
+    }
+  }
+}
--- a/labs/lab8/MyClass/obj/MyClass.csproj.nuget.g.props
+++ b/labs/lab8/MyClass/obj/MyClass.csproj.nuget.g.props
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
+    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
+    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">/home/nik/.nuget/packages/</NuGetPackageRoot>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">/home/nik/.nuget/packages/</NuGetPackageFolders>
+    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
+    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">6.12.4</NuGetToolVersion>
+  </PropertyGroup>
+  <ItemGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <SourceRoot Include="/home/nik/.nuget/packages/" />
+  </ItemGroup>
+</Project>
--- a/labs/lab8/MyClass/obj/MyClass.csproj.nuget.g.targets
+++ b/labs/lab8/MyClass/obj/MyClass.csproj.nuget.g.targets
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" />
--- a/labs/lab8/MyClass/obj/project.assets.json
+++ b/labs/lab8/MyClass/obj/project.assets.json
@@ -0,0 +1,78 @@
+{
+  "version": 3,
+  "targets": {
+    "net9.0": {}
+  },
+  "libraries": {},
+  "projectFileDependencyGroups": {
+    "net9.0": []
+  },
+  "packageFolders": {
+    "/home/nik/.nuget/packages/": {}
+  },
+  "project": {
+    "version": "1.0.0",
+    "restore": {
+      "projectUniqueName": "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj",
+      "projectName": "MyClass",
+      "projectPath": "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj",
+      "packagesPath": "/home/nik/.nuget/packages/",
+      "outputPath": "/home/nik/oop/labs/lab8/MyClass/obj/",
+      "projectStyle": "PackageReference",
+      "configFilePaths": [
+        "/home/nik/.nuget/NuGet/NuGet.Config"
+      ],
+      "originalTargetFrameworks": [
+        "net9.0"
+      ],
+      "sources": {
+        "https://api.nuget.org/v3/index.json": {}
+      },
+      "frameworks": {
+        "net9.0": {
+          "targetAlias": "net9.0",
+          "projectReferences": {}
+        }
+      },
+      "warningProperties": {
+        "warnAsError": [
+          "NU1605"
+        ]
+      },
+      "restoreAuditProperties": {
+        "enableAudit": "true",
+        "auditLevel": "low",
+        "auditMode": "direct"
+      },
+      "SdkAnalysisLevel": "9.0.100"
+    },
+    "frameworks": {
+      "net9.0": {
+        "targetAlias": "net9.0",
+        "imports": [
+          "net461",
+          "net462",
+          "net47",
+          "net471",
+          "net472",
+          "net48",
+          "net481"
+        ],
+        "assetTargetFallback": true,
+        "warn": true,
+        "downloadDependencies": [
+          {
+            "name": "Microsoft.AspNetCore.App.Ref",
+            "version": "[9.0.9, 9.0.9]"
+          }
+        ],
+        "frameworkReferences": {
+          "Microsoft.NETCore.App": {
+            "privateAssets": "all"
+          }
+        },
+        "runtimeIdentifierGraphPath": "/usr/share/dotnet/sdk/9.0.110/PortableRuntimeIdentifierGraph.json"
+      }
+    }
+  }
+}
--- a/labs/lab8/MyClass/obj/project.nuget.cache
+++ b/labs/lab8/MyClass/obj/project.nuget.cache
@@ -0,0 +1,10 @@
+{
+  "version": 2,
+  "dgSpecHash": "v60AduM4H1I=",
+  "success": true,
+  "projectFilePath": "/home/nik/oop/labs/lab8/MyClass/MyClass.csproj",
+  "expectedPackageFiles": [
+    "/home/nik/.nuget/packages/microsoft.aspnetcore.app.ref/9.0.9/microsoft.aspnetcore.app.ref.9.0.9.nupkg.sha512"
+  ],
+  "logs": []
+}
--- a/labs/lab8/Progrssion/ArithmeticProgression.cs
+++ b/labs/lab8/Progrssion/ArithmeticProgression.cs
@@ -0,0 +1,23 @@
+using System;
+
+class ArithmeticProgression : IProgression
+{
+    private int a0;
+    private int b;
+
+    public ArithmeticProgression(int a0, int b)
+    {
+        this.a0 = a0;
+        this.b = b;
+    }
+
+    public int GetElement(int k)
+    {
+        return a0 + (k - 1) * b;
+    }
+
+    public int Sum(int n)
+    {
+        return (2 * a0 + (n - 1) * b) * n / 2;
+    }
+}
--- a/labs/lab8/Progrssion/GeometricProgression.cs
+++ b/labs/lab8/Progrssion/GeometricProgression.cs
@@ -0,0 +1,24 @@
+using System;
+
+class GeometricProgression : IProgression
+{
+    private int p0;
+    private int q;
+
+    public GeometricProgression(int p0, int q)
+    {
+        this.p0 = p0;
+        this.q = q;
+    }
+
+    public int GetElement(int k)
+    {
+        return p0 * (int)Math.Pow(q, k - 1);
+    }
+
+    public int Sum(int n)
+    {
+        if (q == 1) return p0 * n;
+        return p0 * (int)((Math.Pow(q, n) - 1) / (q - 1));
+    }
+}
--- a/labs/lab8/Progrssion/IProgression.cs
+++ b/labs/lab8/Progrssion/IProgression.cs
@@ -0,0 +1,7 @@
+using System;
+
+interface IProgression
+{
+    int GetElement(int k);
+    int Sum(int n);
+}
--- a/labs/lab8/Progrssion/Program.cs
+++ b/labs/lab8/Progrssion/Program.cs
@@ -0,0 +1,18 @@
+using System;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        IProgression arith = new ArithmeticProgression(2, 3);
+        IProgression geom = new GeometricProgression(2, 2);
+
+        Console.WriteLine("Арифметическая прогрессия:");
+        Console.WriteLine("5-й элемент = " + arith.GetElement(5));
+        Console.WriteLine("Сумма 5 элементов = " + arith.Sum(5));
+
+        Console.WriteLine("\nГеометрическая прогрессия:");
+        Console.WriteLine("5-й элемент = " + geom.GetElement(5));
+        Console.WriteLine("Сумма 5 элементов = " + geom.Sum(5));
+    }
+}
--- a/labs/lab8/Progrssion/Progrssion.csproj
+++ b/labs/lab8/Progrssion/Progrssion.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
--- a/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion
+++ b/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion
--- a/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.deps.json
+++ b/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.deps.json
@@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v9.0",
+    "signature": ""
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v9.0": {
+      "Progrssion/1.0.0": {
+        "runtime": {
+          "Progrssion.dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "Progrssion/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}
--- a/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.dll
+++ b/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.dll
--- a/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.pdb
+++ b/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.pdb
--- a/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.runtimeconfig.json
+++ b/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.runtimeconfig.json
@@ -0,0 +1,12 @@
+{
+  "runtimeOptions": {
+    "tfm": "net9.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "9.0.0"
+    },
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/.NETCoreApp,Version=v9.0.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v9.0", FrameworkDisplayName = ".NET 9.0")]
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfo.cs
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfo.cs
@@ -0,0 +1,22 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("Progrssion")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+7c0cae85247e714f121496e471ff040abcdf0f0f")]
+[assembly: System.Reflection.AssemblyProductAttribute("Progrssion")]
+[assembly: System.Reflection.AssemblyTitleAttribute("Progrssion")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfoInputs.cache
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+50a88fde13001e552e5a15c4c1dc9d84bf377c2af97397458f32aa7bfb8ed0ce
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.GeneratedMSBuildEditorConfig.editorconfig
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.GeneratedMSBuildEditorConfig.editorconfig
@@ -0,0 +1,15 @@
+is_global = true
+build_property.TargetFramework = net9.0
+build_property.TargetPlatformMinVersion = 
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = Progrssion
+build_property.ProjectDir = /home/nik/oop/labs/lab8/Progrssion/
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.EffectiveAnalysisLevelStyle = 9.0
+build_property.EnableCodeStyleSeverity = 
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.GlobalUsings.g.cs
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.GlobalUsings.g.cs
@@ -0,0 +1,8 @@
+// <auto-generated/>
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.assets.cache
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.assets.cache
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.csproj.CoreCompileInputs.cache
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+febb35b45ae827ae2cc38bca29142b671a3067babd5d9854467e6c29a7f734b8
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.csproj.FileListAbsolute.txt
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.csproj.FileListAbsolute.txt
@@ -0,0 +1,28 @@
+/home/nik/oop/labs/lab7/Progrssion/bin/Debug/net9.0/Progrssion
+/home/nik/oop/labs/lab7/Progrssion/bin/Debug/net9.0/Progrssion.deps.json
+/home/nik/oop/labs/lab7/Progrssion/bin/Debug/net9.0/Progrssion.runtimeconfig.json
+/home/nik/oop/labs/lab7/Progrssion/bin/Debug/net9.0/Progrssion.dll
+/home/nik/oop/labs/lab7/Progrssion/bin/Debug/net9.0/Progrssion.pdb
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.GeneratedMSBuildEditorConfig.editorconfig
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfoInputs.cache
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfo.cs
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.csproj.CoreCompileInputs.cache
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.dll
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/refint/Progrssion.dll
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.pdb
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/Progrssion.genruntimeconfig.cache
+/home/nik/oop/labs/lab7/Progrssion/obj/Debug/net9.0/ref/Progrssion.dll
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.GeneratedMSBuildEditorConfig.editorconfig
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfoInputs.cache
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.AssemblyInfo.cs
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.csproj.CoreCompileInputs.cache
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.dll
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/refint/Progrssion.dll
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.pdb
+/home/nik/oop/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion
+/home/nik/oop/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.deps.json
+/home/nik/oop/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.runtimeconfig.json
+/home/nik/oop/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.dll
+/home/nik/oop/labs/lab8/Progrssion/bin/Debug/net9.0/Progrssion.pdb
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.genruntimeconfig.cache
+/home/nik/oop/labs/lab8/Progrssion/obj/Debug/net9.0/ref/Progrssion.dll
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.dll
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.dll
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.genruntimeconfig.cache
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.genruntimeconfig.cache
@@ -0,0 +1 @@
+b9720ec9fc833a3887df304a58803c131b5c329c227cb6c752c6888eb7c287f6
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.pdb
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/Progrssion.pdb
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/apphost
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/apphost
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/ref/Progrssion.dll
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/ref/Progrssion.dll
--- a/labs/lab8/Progrssion/obj/Debug/net9.0/refint/Progrssion.dll
+++ b/labs/lab8/Progrssion/obj/Debug/net9.0/refint/Progrssion.dll
--- a/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.dgspec.json
+++ b/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.dgspec.json
@@ -0,0 +1,73 @@
+{
+  "format": 1,
+  "restore": {
+    "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj": {}
+  },
+  "projects": {
+    "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj": {
+      "version": "1.0.0",
+      "restore": {
+        "projectUniqueName": "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj",
+        "projectName": "Progrssion",
+        "projectPath": "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj",
+        "packagesPath": "/home/nik/.nuget/packages/",
+        "outputPath": "/home/nik/oop/labs/lab8/Progrssion/obj/",
+        "projectStyle": "PackageReference",
+        "configFilePaths": [
+          "/home/nik/.nuget/NuGet/NuGet.Config"
+        ],
+        "originalTargetFrameworks": [
+          "net9.0"
+        ],
+        "sources": {
+          "https://api.nuget.org/v3/index.json": {}
+        },
+        "frameworks": {
+          "net9.0": {
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+            "projectReferences": {}
+          }
+        },
+        "warningProperties": {
+          "warnAsError": [
+            "NU1605"
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+        "restoreAuditProperties": {
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+          "auditMode": "direct"
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+      },
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+          "imports": [
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+            "net462",
+            "net47",
+            "net471",
+            "net472",
+            "net48",
+            "net481"
+          ],
+          "assetTargetFallback": true,
+          "warn": true,
+          "downloadDependencies": [
+            {
+              "name": "Microsoft.AspNetCore.App.Ref",
+              "version": "[9.0.9, 9.0.9]"
+            }
+          ],
+          "frameworkReferences": {
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+              "privateAssets": "all"
+            }
+          },
+          "runtimeIdentifierGraphPath": "/usr/share/dotnet/sdk/9.0.110/PortableRuntimeIdentifierGraph.json"
+        }
+      }
+    }
+  }
+}
--- a/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.g.props
+++ b/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.g.props
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
+    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
+    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">/home/nik/.nuget/packages/</NuGetPackageRoot>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">/home/nik/.nuget/packages/</NuGetPackageFolders>
+    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
+    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">6.12.4</NuGetToolVersion>
+  </PropertyGroup>
+  <ItemGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <SourceRoot Include="/home/nik/.nuget/packages/" />
+  </ItemGroup>
+</Project>
--- a/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.g.targets
+++ b/labs/lab8/Progrssion/obj/Progrssion.csproj.nuget.g.targets
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" />
--- a/labs/lab8/Progrssion/obj/project.assets.json
+++ b/labs/lab8/Progrssion/obj/project.assets.json
@@ -0,0 +1,78 @@
+{
+  "version": 3,
+  "targets": {
+    "net9.0": {}
+  },
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+  "projectFileDependencyGroups": {
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+  "packageFolders": {
+    "/home/nik/.nuget/packages/": {}
+  },
+  "project": {
+    "version": "1.0.0",
+    "restore": {
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+      "projectName": "Progrssion",
+      "projectPath": "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj",
+      "packagesPath": "/home/nik/.nuget/packages/",
+      "outputPath": "/home/nik/oop/labs/lab8/Progrssion/obj/",
+      "projectStyle": "PackageReference",
+      "configFilePaths": [
+        "/home/nik/.nuget/NuGet/NuGet.Config"
+      ],
+      "originalTargetFrameworks": [
+        "net9.0"
+      ],
+      "sources": {
+        "https://api.nuget.org/v3/index.json": {}
+      },
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+          "projectReferences": {}
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+      "warningProperties": {
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+          "NU1605"
+        ]
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+      "restoreAuditProperties": {
+        "enableAudit": "true",
+        "auditLevel": "low",
+        "auditMode": "direct"
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+      "SdkAnalysisLevel": "9.0.100"
+    },
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+        "imports": [
+          "net461",
+          "net462",
+          "net47",
+          "net471",
+          "net472",
+          "net48",
+          "net481"
+        ],
+        "assetTargetFallback": true,
+        "warn": true,
+        "downloadDependencies": [
+          {
+            "name": "Microsoft.AspNetCore.App.Ref",
+            "version": "[9.0.9, 9.0.9]"
+          }
+        ],
+        "frameworkReferences": {
+          "Microsoft.NETCore.App": {
+            "privateAssets": "all"
+          }
+        },
+        "runtimeIdentifierGraphPath": "/usr/share/dotnet/sdk/9.0.110/PortableRuntimeIdentifierGraph.json"
+      }
+    }
+  }
+}
--- a/labs/lab8/Progrssion/obj/project.nuget.cache
+++ b/labs/lab8/Progrssion/obj/project.nuget.cache
@@ -0,0 +1,10 @@
+{
+  "version": 2,
+  "dgSpecHash": "+4R2gX25Pfg=",
+  "success": true,
+  "projectFilePath": "/home/nik/oop/labs/lab8/Progrssion/Progrssion.csproj",
+  "expectedPackageFiles": [
+    "/home/nik/.nuget/packages/microsoft.aspnetcore.app.ref/9.0.9/microsoft.aspnetcore.app.ref.9.0.9.nupkg.sha512"
+  ],
+  "logs": []
+}
--- a/labs/lab8/assets/1.png
+++ b/labs/lab8/assets/1.png
--- a/labs/lab8/assets/2.png
+++ b/labs/lab8/assets/2.png
--- a/labs/lab8/assets/3.png
+++ b/labs/lab8/assets/3.png
--- a/labs/lab8/report.pdf
+++ b/labs/lab8/report.pdf
--- a/labs/lab8/report.typ
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+#set text(size: 1.3em)
+
+#show raw.where(block: false): box.with(
+  fill: luma(240),
+  inset: (x: 3pt, y: 0pt),
+  outset: (y: 3pt),
+  radius: 2pt,
+)
+
+#show raw.where(block: true): block.with(
+  fill: luma(240),
+  inset: 10pt,
+  radius: 4pt,
+)
+    
+// title
+    
+#align(center)[Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики]
+\
+\
+\
+#align(center)[Факультет инфокоммуникационных технологий]
+#align(center)[Направление подготовки 11.03.02]
+\
+\
+#align(center)[Лабораторная работа №8]
+#align(center)[Использование интерфейсов при реализации иерархии классов]
+\
+\
+\ //#align(center)[Вариант 19]
+\
+\
+\
+\
+\
+\
+\
+#align(right)[Выполнил:]
+#align(right)[Дощенников Никита Андреевич]
+#align(right)[Группа: К3221]
+#align(right)[Проверил:]
+#align(right)[Иванов Сергей Евгеньевич]
+\
+\
+#align(center)[Санкт-Петербург]
+#align(center)[2025]
+
+#pagebreak()
+    
+=== Цель работы:
+
+Использовать интерфейсы при реализации иерархии классов как важного элемента объектно-ориентированного программирования и приобретение навыков реализации интерфейсов.
+
+=== Упражнение 1. Создание и реализация интерфейса.
+
+В этом упражнении я создал интерфейс, определяющий поведение классов, которые будут его реализовывать.
+
+```cs
+using System;
+
+interface IPubs
+{
+    void Subs();
+    bool IfSubs { get; set; }
+}
+```
+
+```cs
+using System;
+
+class Magazine : Item, IPubs
+{
+    private String volume;
+    private int number;
+    private String title;
+    private int year;
+
+    public Magazine(String volume, int number, String title, int year, long invNumber, bool taken) : base(invNumber, taken)
+    {
+        this.volume = volume;
+        this.number = number;
+        this.title = title;
+        this.year = year;
+    }
+
+    public Magazine()
+    {}
+
+    public override void Show()
+    {
+        Console.WriteLine("\nЖурнал:\n Том: {0}\n Номер: {1}\n Название: {2}\n Год выпуска: {3}", volume, number, title, year);
+        base.Show();
+    }
+
+
+    public override void Return()
+    {
+        taken = true;
+    }
+
+    public bool IfSubs { get; set; }
+
+    public void Subs()
+    {
+        Console.WriteLine("Подписка на журнал \"{0}\": {1}.", title, IfSubs);
+    }
+
+}
+```
+
+Тесты: 
+
+```cs
+public static void Main(string[] args)
+{
+    Magazine mag1 = new Magazine("О природе", 5, "Земля и мы", 2014, 1235, true);
+    mag1.TakeItem();
+    mag1.Show();
+    mag1.IfSubs = true;
+    mag1.Subs();
+}
+```
+
+Пример: 
+
+#align(center)[#image("assets/1.png")]
+
+=== Упражнение 2. Использование стандартных интерфейсов.
+
+В этом упражнении я применил интерфейс `IComparable`, который задает метод сравнения объектов по принципу больше и меньше, что позволяет переопределить соответствующие операции в рамках класса, наследующего интерфейс `IComparable`.
+
+```cs
+using System; 
+
+abstract class Item : IComparable
+{
+    protected long invNumber;
+    protected bool taken;
+
+    public Item(long invNumber, bool taken)
+    {
+        this.invNumber = invNumber;
+        this.taken = taken;
+    }
+
+    public Item()
+    {
+        this.taken = true;
+    }
+
+    public bool IsAvailable()
+    {
+        return taken;
+    }
+
+    public long GetInvNumber()
+    {
+        return invNumber;
+    }
+
+    private void Take()
+    {
+        taken = false;
+    }
+
+    public void TakeItem()
+    {
+        if (this.IsAvailable())
+            this.Take();
+    }
+
+
+    abstract public void Return();
+
+    public virtual void Show()
+    {
+        Console.WriteLine("Состояние единицы хранения:\n Инвентарный номер: {0}\n Наличие: {1}", invNumber, taken);
+    }
+
+    int IComparable.CompareTo(object obj)
+    {
+        Item it = (Item)obj;
+        if (this.invNumber == it.invNumber) return 0;
+        else if (this.invNumber > it.invNumber) return 1;
+        else return -1;
+    }
+}
+```
+
+Тесты:
+
+```cs
+public static void Main(string[] args)
+{
+    Item[] items = new Item[4];
+    items[0] = b1;
+    items[1] = b2;
+    items[2] = b3;
+    items[3] = mag1;
+
+    Array.Sort(items);
+
+    Console.WriteLine("\nСортировка по инвентарному номеру");
+    foreach (Item x in items)
+    {
+        x.Show();
+    }
+}
+```
+
+Пример: 
+
+#align(center)[#image("assets/2.png")]
+
+=== Упражнение 3. Реализация прогрессии с помощью интерфейса.
+
+В этом упражнении я заменил абстрактный класс `Progression` на интерфейс `IProgression`, определяющий поведение классов `ArithmeticProgression` и `GeometricProgression`, описывающих арифметическую и геометрическую прогрессии.
+
+```cs
+using System;
+
+interface IProgression
+{
+    int GetElement(int k);
+    int Sum(int n);
+}
+```
+
+```cs
+using System;
+
+class ArithmeticProgression : IProgression
+{
+    private int a0;
+    private int b;
+
+    public ArithmeticProgression(int a0, int b)
+    {
+        this.a0 = a0;
+        this.b = b;
+    }
+
+    public int GetElement(int k)
+    {
+        return a0 + (k - 1) * b;
+    }
+
+    public int Sum(int n)
+    {
+        return (2 * a0 + (n - 1) * b) * n / 2;
+    }
+}
+```
+
+```cs
+using System;
+
+class GeometricProgression : IProgression
+{
+    private int p0;
+    private int q;
+
+    public GeometricProgression(int p0, int q)
+    {
+        this.p0 = p0;
+        this.q = q;
+    }
+
+    public int GetElement(int k)
+    {
+        return p0 * (int)Math.Pow(q, k - 1);
+    }
+
+    public int Sum(int n)
+    {
+        if (q == 1) return p0 * n;
+        return p0 * (int)((Math.Pow(q, n) - 1) / (q - 1));
+    }
+}
+```
+
+Тесты: 
+
+```cs
+public static void Main(string[] args)
+{
+    IProgression arith = new ArithmeticProgression(2, 3);
+    IProgression geom = new GeometricProgression(2, 2);
+
+    Console.WriteLine("Арифметическая прогрессия:");
+    Console.WriteLine("5-й элемент = " + arith.GetElement(5));
+    Console.WriteLine("Сумма 5 элементов = " + arith.Sum(5));
+
+    Console.WriteLine("\nГеометрическая прогрессия:");
+    Console.WriteLine("5-й элемент = " + geom.GetElement(5));
+    Console.WriteLine("Сумма 5 элементов = " + geom.Sum(5));
+}
+```
+
+Пример: 
+
+#align(center)[#image("assets/3.png")]
+
+=== Выводы.
+
+В ходе проделанной лабораторной работы я использовал интерфейсы при реализации иерархии классов как важного элемента объектно-ориентированного программирования и приобретел навыки реализации интерфейсов.
+
+=== Code review. (by #link("https://zzzcode.ai")[zzzcode.ai])
+
+*Резюме*
+
+Класс `Book` представляет собой реализацию книги с различными атрибутами, такими как автор, название, издатель и т.д. Он наследуется от абстрактного класса `Item`, который управляет состоянием доступности книги. Код в целом хорошо структурирован, но требует некоторых улучшений в области стиля и производительности.
+
+*Ошибка*
+
+В методе `Return()` класса `Book` переменная `taken` устанавливается в значение `returnSrok`, которое по умолчанию равно `false`. Это может привести к тому, что книга будет считаться возвращенной, даже если она не была возвращена. Следует добавить логику для проверки состояния возврата.
+
+*Стиль кода*
+
+Использование `String` вместо `string` не соответствует общепринятому стилю C\#. Рекомендуется использовать `string` (с маленькой буквы). Имена переменных и методов должны следовать соглашениям о наименовании. Например, `returnSrok` можно переименовать в `isReturned` для большей ясности.
+
+*Структура кода*
+
+Класс `Book` имеет хорошую структуру, однако: Конструкторы перегружены, что может усложнить создание объектов. Рекомендуется использовать один конструктор с параметрами по умолчанию. Метод `SetBook` можно заменить на использование свойств, что улучшит инкапсуляцию.
+
+*Читаемость*
+
+Код читаем, но можно улучшить: Добавить XML-комментарии к методам и классам для лучшего понимания их назначения. Разделить длинные строки на несколько строк для повышения читаемости.
+
+*Производительность*
+
+Статическая переменная `price` может быть изменена через метод `SetPrice`, что может привести к неожиданным изменениям. Рекомендуется сделать её свойством только для чтения или использовать паттерн Singleton для управления ценой.
+
+*Масштабируемость*
+
+Класс `Book` может быть расширен для поддержки дополнительных атрибутов, таких как жанр или ISBN. Однако, если количество атрибутов увеличится, стоит рассмотреть возможность использования паттерна проектирования, такого как `Builder`.
+
+*Безопасность*
+
+Необходимо добавить валидацию входных данных в конструкторах и методах, чтобы предотвратить создание объектов с некорректными значениями (например, отрицательное количество страниц или год).
+
+*Обработка ошибок*
+
+В текущем коде отсутствует обработка исключений. Рекомендуется добавить обработку ошибок, особенно в методах, которые могут вызывать исключения, таких как `PriceBook`.
+
+*Заключение*
+
+Класс `Book` и его реализация в целом являются хорошей основой для работы с книгами. Однако, для улучшения качества кода и его поддержки, необходимо внести изменения в стиль, структуру и обработку ошибок. Рекомендуется также рассмотреть возможность добавления тестов для проверки функциональности классов.
+
+
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