简单计算器

#include<stdio.h>int add(int x,int y){    return x+y;}int sub(int x,int y){    return x-y;}int mul (int x,int y){    return x*y;}int div(int x,int y){    return x/y;}int main(){    int input = 1;    int x;    int y;    int ret = 0;    int (*p[5])(int x,int y) = {0,add,sub,mul,div};//转移表    while(input)    {            printf("************************************\n");            printf("*****%%%%%%%1:add   2:sub%%%%%%*****\n");            printf("*****%%%%%%%3:mul   4:div%%%%%%*****\n");            printf("************************************\n");            scanf("%d",&input);            printf("请输入两个数字：");            scanf("%d %d",&x,&y);            ret = p[input](x,y);            printf("ret = %d\n",ret);    }    return 0;}