public static void MainMenu() { Console.Clear(); Console.WriteLine("\t\t\tWelcome to the Main Menu\n\n" + "Pick an option or press ESC to exit\n\n" + "Calculate Circumference and Area of a circle: Press 1\n" + "Calculate Volume of a Hemisphere: Press 2\n" + "Calculate Area of a triangle: Press 3\n" + "To solve a quadratic equation: Press 4 \n\n"); var input = Console.ReadKey(true); var math = new MathFormulas(); var quadraticEq = new QuadraticEquation(); switch (input.Key) { case Escape: Console.WriteLine("bye bye..."); Console.Clear(); throw new Exception("I Forgot how to stop console application, so i'll just throw an exception..."); case D1: math.Circumference(); break; case D2: math.Volume(); break; case D3: math.AreaOfTriangle(); break; case D4: Console.WriteLine(quadraticEq.QudraticEq()); Console.ReadLine(); MainMenu(); break; default: MainMenu(); break; } }