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labs/lab5_done/ArrayProcess/Program.cs

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+using System;
+
+public class Program
+{
+    static int SumPos(int[] a)
+    {
+        int r = 0;
+        foreach (int x in a) if (x > 0) r += x;
+        return r;
+    }
+
+    static int SumNeg(int[] a)
+    {
+        int r = 0;
+        foreach (int x in a) if (x < 0) r += x;
+        return r;
+    }
+
+    static int SumArr(int[] a) => SumPos(a) + SumNeg(a);
+
+    static double AvgArr(int[] a) => a.Length == 0 ? double.NaN : (double)SumArr(a) / a.Length;
+
+    static int SumEvenPos(int[] a)
+    {
+        int r = 0;
+        for (int i = 0; i < a.Length; i += 2) r += a[i];
+        return r;
+    }
+
+    static int SumOddPos(int[] a)
+    {
+        int r = 0;
+        for (int i = 1; i < a.Length; i += 2) r += a[i];
+        return r;
+    }
+
+    static int MaxIdx(int[] a)
+    {
+        if (a.Length == 0) return -1;
+        int idx = 0, m = a[0];
+        for (int i = 1; i < a.Length; i++)
+            if (a[i] > m) { m = a[i]; idx = i; }
+        return idx;
+    }
+
+    static int MinIdx(int[] a)
+    {
+        if (a.Length == 0) return -1;
+        int idx = 0, m = a[0];
+        for (int i = 1; i < a.Length; i++)
+            if (a[i] < m) { m = a[i]; idx = i; }
+        return idx;
+    }
+
+    static int ProductBetweenMinMax(int[] a)
+    {
+        int start = MinIdx(a), end = MaxIdx(a);
+        if (start == -1 || end == -1) return -1;
+        if (start > end) { int t = start; start = end; end = t; }
+        if (end - start <= 1) return -1;
+        int r = 1;
+        for (int i = start + 1; i < end; i++) r *= a[i];
+        return r;
+    }
+
+    public static void Main(string[] args)
+    {
+        Console.Write("input an arr length: ");
+        int n = int.Parse(Console.ReadLine());
+        int[] arr = new int[n];
+
+        for (int i = 0; i < arr.Length; i++)
+        {
+            Console.Write("arr[{0}] = ", i);
+            arr[i] = int.Parse(Console.ReadLine());
+        }
+
+        Console.WriteLine("sum of the array's elements is {0}", SumArr(arr));
+        Console.WriteLine("avg value of the array is {0}", AvgArr(arr));
+        Console.WriteLine("sum of positive array values is {0}, sum of negative array values is {1}", SumPos(arr), SumNeg(arr));
+        Console.WriteLine("sum of elements on even positions is {0}, sum of elements on odd positions is {1}", SumEvenPos(arr), SumOddPos(arr));
+        Console.WriteLine("index of max array element is {0}", MaxIdx(arr));
+        Console.WriteLine("index of min array element is {0}", MinIdx(arr));
+        Console.WriteLine("product of numbers between min and max is {0}", ProductBetweenMinMax(arr));
+    }
+}
+