C#题编写一个进行加减乘除四则运算的程序，要求；输出2个单精度数，然后输入一个运算符号，输出结果

Answer 1

新鲜出炉的，来吧。
  class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Calcu();
                Console.WriteLine("是否继续执行循环？Y/N");
                string s = Console.ReadLine();
                if (s.ToUpper() == "Y")
                {
                    Calcu();
                    continue;
                }
                break;
            }
        }

        static void Calcu()
        {
            Console.WriteLine("请输入第一个数字：");
            float num1 = 0;
            float num2 = 0;
            string fuhao = "";
            while (true)
            {
                try
                {
                    num1 = Convert.ToSingle(Console.ReadLine());
                    break;
                }
                catch (Exception)
                {
                    num1 = 0;
                    Console.WriteLine("输入错误，请重新输入第一个数字：");
                }
            }
            Console.WriteLine("请输入第二个数字：");
            while (true)
            {
                try
                {
                    num2 = Convert.ToSingle(Console.ReadLine());
                    break;
                }
                catch (Exception)
                {
                    num2 = 0;
                    Console.WriteLine("输入错误，请重新输入第二个数字：");
                }
            }
            Console.WriteLine("请输入运算符(+ - * /)：");
            while (true)
            {
                try
                {
                    fuhao = Console.ReadLine();
                    if (fuhao == "+" || fuhao == "-" || fuhao == "*" || fuhao == "/")
                        break;
                    fuhao = "";
                    Console.WriteLine("运算符输入错误，请重新输入运算符(+ - * /)：");
                }
                catch (Exception)
                {
                    fuhao = "";
                    Console.WriteLine("运算符输入错误，请重新输入运算符(+ - * /)");
                }
            }
            float num = 0;
            switch (fuhao)
            {
                case "+": num = num1 + num2; break;
                case "-": num = num1 - num2; break;
                case "*": num = num1 * num2; break;
                case "/": num = num1 / num2; break;
            }
            Console.WriteLine("运算结果出炉： "+num1 + fuhao + num2 + "=" + num);
        }
    }