using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace _0922方法练习
{
    class Program
    {
        static void Main(string[] args)
        {
            //计算两个数字的和，
            //要求第一个数字必须比第二个数字小，否则重新输入
            Console.WriteLine("请输入第一个数字");
            string strNumberOne = Console.ReadLine();
            int numberOne = GetNumber(strNumberOne);
            Console.WriteLine("请输入第二个数字");
            string strNumberTwo = Console.ReadLine();
            int numberTwo = GetNumber(strNumberTwo);
            JudgeNumber(ref numberOne, ref numberTwo);
            int sum = GetSum(numberOne, numberTwo);
            Console.WriteLine(sum);
            Console.ReadKey();
        }
        public static int GetSum(int n1,int n2)
        {
            int sum = n1 + n2;
            return sum;
        }


        public static void JudgeNumber(ref int n1, ref int n2)
        {
            while (true)
            {
                if (n1 < n2)
                {
                    return;
                }
                else
                {
                    Console.WriteLine("第一个数字不能大于第二个数字,重新输入第一个数字");
                    string s1 = Console.ReadLine();
                    n1 = GetNumber(s1);
                    Console.WriteLine("请输入第二个数");
                    string s2 = Console.ReadLine();
                    n2 = GetNumber(s2);
                }


            }
        }
        public static int GetNumber(string s)
        {
            while (true)
            {
                try
                {
                    int number = Convert.ToInt32(s);
                    return number;
                }
                catch
                {
                    Console.WriteLine("输入有误");
                    s = Console.ReadLine();
                }
            }
        }
    }
}