static void Main(string[] args) { square sq1 = new square(2, 3); circle cr = new circle(2, 3, 4); cr.show(); sq1.show(); //Task_01 Console.Write("***********\nTASK_01\n***********\n"); square sq = new square(2, 3); Console.WriteLine(sq.ToString()); Console.Write("\n\n***********\nTASK_02\n***********\n"); Console.Write("\nEnter value 1: "); double a = double.Parse(Console.ReadLine()); Console.Write("\nEnter value 2: "); double b = double.Parse(Console.ReadLine()); //circle c=new circle(2,3,4); calculator cal = new calculator(a, b); int i = 1; while (i == 1) { Console.WriteLine("\nChoose any one operation:\n"); Console.WriteLine("1: ADD\n"); Console.WriteLine("2: SUBSTRACT\n"); Console.WriteLine("3: MULTIPLY\n"); Console.WriteLine("4: DIVIDE\n"); Console.WriteLine("0: EXIT\n"); int opt = int.Parse(Console.ReadLine()); if (opt == 1) { Console.WriteLine("\n" + a + "+" + b + "= " + cal.add()); } else if (opt == 2) { Console.WriteLine("\n" + a + "-" + b + "= " + cal.sub()); } else if (opt == 3) { Console.WriteLine("\n" + a + "*" + b + "= " + cal.mul()); } else if (opt == 4) { Console.WriteLine("\n" + a + "/" + b + "= " + cal.div()); } else if (opt == 0) { i = 0; } } //Console.WriteLine(c.ToString()); Console.ReadKey(); }