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labs/lab4_done/Utils/Operation.cs

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+using System;
+
+public class Operation
+{
+    public static double TriangleArea(double a, double b, double c)
+    {
+        double p = (a + b + c) / 2;
+        bool exists = CheckTriangle(a, b, c);
+        if (!exists)
+            return -1;
+
+        return Math.Sqrt(p * (p - a) * (p - b) * (p - c));
+    }
+
+    public static double TriangleArea(double a)
+    {
+        return TriangleArea(a, a, a);
+    }
+
+
+    public static bool CheckTriangle(double a, double b, double c)
+    {
+        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;
+    }
+
+    public static int SolveQuadratic(int a, int b, int c, out double x1, out double x2)
+    {
+        double d = b * b - 4 * a * c;
+        if (d > 0)
+        {
+            x1 = (-b + Math.Sqrt(d)) / (2 * a);
+            x2 = (-b - Math.Sqrt(d)) / (2 * a);
+            return 1;
+        }
+        else if (d == 0)
+        {
+            x1 = x2 = -b / (2 * a);
+            return 0;
+        }
+        else
+        {
+            x1 = x2 = -1;
+            return -1;
+        }
+    }
+
+}