程序代码：

#include<stdio.h>
#include<math.h>
void dislpaymenu()
{
    printf("\t\t         ****计算器菜单****\n");
    printf("\t\t         *****1.加法*****\n");
    printf("\t\t         *****2.减法*****\n");
    printf("\t\t         *****3.乘法*****\n");
    printf("\t\t         *****4.除法*****\n");
    printf("\t\t         *****5.退出*****\n");
}
void main()
{
    while(1)
    {
    int select;
    dislpaymenu();
    scanf("%d",&select);
    switch(select)
    {
        int result,a,b;
        case 1:
            printf("进入加法程序\n");
            printf("please intput two counts\n");
            scanf("%d%d",&a,&b);
            printf("结果为%d\n",result=a+b);
        break;
        case 2:
            printf("进入减法程序\n");
            printf("please intput two counts\n");
            scanf("%d%d",&a,&b);
            printf("结果为%d\n",result=a-b);
        break;
        case 3:
            printf("进入乘法程序\n");
            printf("please intput two counts\n");
            scanf("%d%d",&a,&b);
            printf("结果为%d\n",result=a*b);
        break;
        case 4:
            printf("进入除法程序\n");
            printf("please intput two counts\n");
            scanf("%d%d",&a,&b);
            printf("结果为%d\n",result=a/b);
        break;
        case 5:
         exit();
        break;
    }
    }
}