变量的定义和四则运算

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            //变量的定义
            int a,b;
            int sum,dif,pro,quo;
            //赋值与加、减、乘、除计算公式
            a = 8;
            b = 4;
            sum=a+b;
            dif=a-b;
            pro=a*b;
            quo=a/b;
            //在cmd中输出结果
            Console.WriteLine("a={0}", a);
            Console.WriteLine("b={0}", b);
            Console.WriteLine("{0}+{1}={2}", a, b, sum);
            Console.WriteLine("{0}-{1}={2}", a, b, dif);
            Console.WriteLine("{0}*{1}={2}", a, b, pro);
            Console.WriteLine("{0}/{1}={2}", a, b, quo);
            //变量a值的变化
            a=100;
            a=a+1;
            Console.WriteLine(a);

        }
    }
}

运行的结果如下：