超市会员积分管理系统用C语言怎么写

以下是一个简单的超市会员积分管理系统C语言示例：

#include <stdio.h>
#include <stdlib.h>

// 定义会员结构体
struct Member {
    int id;
    char name[20];
    int points;
};

// 显示菜单
void showMenu() {
    printf("1. 查询会员积分\n");
    printf("2. 增加会员积分\n");
    printf("3. 减少会员积分\n");
    printf("4. 退出\n");
}

// 查询会员积分
void queryPoints(struct Member members[], int count) {
    int id;
    printf("请输入会员ID：");
    scanf("%d", &id);
    for (int i = 0; i < count; i++) {
        if (members[i].id == id) {
            printf("会员姓名：%s，积分：%d\n", members[i].name, members[i].points);
            return;
        }
    }
    printf("未找到该会员！\n");
}

// 增加会员积分
void addPoints(struct Member members[], int count) {
    int id, points;
    printf("请输入会员ID：");
    scanf("%d", &id);
    for (int i = 0; i < count; i++) {
        if (members[i].id == id) {
            printf("请输入增加的积分数：");
            scanf("%d", &points);
            members[i].points += points;
            printf("会员姓名：%s，积分：%d\n", members[i].name, members[i].points);
            return;
        }
    }
    printf("未找到该会员！\n");
}

// 减少会员积分
void reducePoints(struct Member members[], int count) {
    int id, points;
    printf("请输入会员ID：");
    scanf("%d", &id);
    for (int i = 0; i < count; i++) {
        if (members[i].id == id) {
            printf("请输入减少的积分数：");
            scanf("%d", &points);
            if (members[i].points < points) {
                printf("积分不足，减少失败！\n");
                return;
            }
            members[i].points -= points;
            printf("会员姓名：%s，积分：%d\n", members[i].name, members[i].points);
            return;
        }
    }
    printf("未找到该会员！\n");
}

int main() {
    int count = 3; // 会员数量
    struct Member members[3] = {
        {1001, "张三", 100},
        {1002, "李四", 200},
        {1003, "王五", 300}
    };
    int choice;
    while (1) {
        showMenu();
        printf("请输入您的选择：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                queryPoints(members, count);
                break;
            case 2:
                addPoints(members, count);
                break;
            case 3:
                reducePoints(members, count);
                break;
            case 4:
                exit(0);
            default:
                printf("输入有误，请重新输入！\n");
        }
    }
    return 0;
}

以上代码实现了一个简单的超市会员积分管理系统，包括查询会员积分、增加会员积分、减少会员积分等功能。你可以根据需求进行修改和完善。