学习了，谢谢！

好人了  帮顶··

#include<stdio.h>
int main()
{
    int x,y,n;
    int label=1;
    printf("\n******开始******\n");
    printf("    输入1为加法:\n");
    printf("    输入2为减法:\n");
    printf("    输入3为乘法:\n");
    printf("    输入4为除法:\n");
    printf("    输入5为退出:\n");
    while(label)
    {
        printf("\n请输入操作：\n");
        scanf("%d",&n);
        switch(n)
        {
        case 1:
            printf("输入为加法\n");
            printf("请输入所要操作的数：\n");
            scanf("%d %d",&x,&y);
            printf("输入的为加法:\n%d+%d=%d\n",x,y,x+y);
            break;
        case 2:
            printf("输入为减法\n");
            printf("请输入所要操作的数：\n");
            scanf("%d %d",&x,&y);
            printf("输入的为减法:\n%d-%d=%d\n",x,y,x-y);
            break;
        case 3:
            printf("输入为乘法\n");
            printf("请输入所要操作的数：\n");
            scanf("%d %d",&x,&y);
            printf("输入的为乘法:\n%d*%d=%d\n",x,y,x*y);
            break;
        case 4:
            printf("输入为除法\n");
            printf("请输入所要操作的数：\n");
            scanf("%d %d",&x,&y);
            printf("输入的为除法:\n%d/%d=%d\n",x,y,x/y);
            break;
        case 5:
            label=0;
            break;
        default:
            printf("输入错误，请输入1-5的整数");
        }

    }
    return 0;
}
这个也可以的

好好学习，天天向上。

我还只是菜鸟。学无止尽！高手们多多指点啊