记录一次编程记录

using System;

namespace ConsoleApp6
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine("欢迎使用计算器v2.0");

        A: Console.WriteLine("输入1进入程序，输入2查看更新内容\n");
            int first;
            try//运行可能会出错的代码
            {
                first = int.Parse(Console.ReadLine());//接收用户所输入的值，并将其转换为int型
            }
            catch (Exception)//捕捉错误
            {
                Console.WriteLine("请输入数字");
                goto A;
            }

            if (first == 1|| first == 2)//判断输入的数字是否为1或2
            {

                if (first == 1)//如果是1
                {
                    goto B;
                }

                if (first == 2)//如果是2
                {
                    Console.WriteLine("1.丰富了内容\n2.更新了更优秀的运算逻辑\n3.增加排错提示\n");
                    goto A;
                }

   
            }
            else//如果不是1或2
            {
                Console.WriteLine("请输入正确的数字\n");
                goto A;
            }


        B: Console.WriteLine("请输入第一个数字");
            int second;
            try
            {
                second = int.Parse(Console.ReadLine());//同上
            }
            catch (Exception)
            {
                Console.WriteLine("请输入数字\n");
                goto B;
            }
        C : Console.WriteLine("请输入运算符，+-*/\n");
            string third;
            third = Console.ReadLine();
            if (third == "+" || third == "-" || third == "*" || third == "/")//判断输入的运算符是否合法
            {
                goto D;
            }
            else//如果不合法的话...
            {
                Console.WriteLine("请输入正确的运算符\n");
                goto C;
            }
        D:  Console.WriteLine("请输入第二个数字");
            int fourth;
            try
            {
                fourth = int.Parse(Console.ReadLine());//同上
            }
            catch (Exception)
            {
                Console.WriteLine("请输入数字\n");
                goto D;
            }
            //判断输入的运算符
            if(third == "+")
            {
                Add(second, fourth);
            }
            if (third == "-")
            {
                Minus(second, fourth);
            }
            if (third == "*")
            {
                Mul(second, fourth);
            }
            if (third == "/")
            {
                Div(second, fourth);
            }

        }
        //运算
        static void Add(int a , int b)
        {
            int c;
            c = a + b;
            Console.WriteLine("\n结果等于" + c);
            Console.ReadKey();
        }
        static void Minus(int a, int b)
        {
            int c;
            c = a - b;
            Console.WriteLine("\n结果等于" + c);
            Console.ReadKey();
        }
        static void Mul(int a, int b)
        {
            int c;
            c = a * b;
            Console.WriteLine("\n结果等于" + c);
            Console.ReadKey();
        }
        static void Div(int a, int b)
        {
            int c;
            c = a / b;
            Console.WriteLine("\n结果等于" + c);
            Console.ReadKey();
        }
    }
}