利用函数指针数组写一个计算器

时间：2020-10-08 19:11:46 收藏：0 阅读：24
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

void muen(){
    printf("=======================\n");
    printf("==1.加 2.减 3.乘 4.除==\n");
    printf("==========0.退出=======\n");
    printf("=======================\n");

}
int jia(int x, int y){
    return x + y;
}
int jian(int x, int y){
    return x - y;
}
int chen(int x, int y){
    return x * y;
}
int chu(int x, int y){
    return x / y;
}

int main(){
    int input = 0;
    int x = 0;
    int y = 0;
    int(*arr[])(int, int) = {0,jia,jian,chen,chu};
    //创建一个函数指针数组
    do
    {
        muen();
        printf("请输入:>");
        scanf("%d", &input);
        if (input >= 1 && input < 5)
        {
            printf("请输入两个操作数:>");
            scanf("%d%d", &x, &y);
            int ret=arr[input](x, y);
            printf("%d\n", ret);
        }
        else if (input == 0)
        {
            printf("退出\n");
        }
        else
        {
            printf("输入有误\n");
        }
    } while (input);
    return 0;
}