贺老师教学链接  C语言及程序设计提高 本课讲解

一个简例

#include <stdio.h>
int choose();
void eat(int, char*);
void sleep(int);
void hitdoudou();
int main()
{
    int iChioce;
    do
    {
        iChioce=choose();
        if (iChioce==1)
            eat(2, "鲜鱼");
        else if (iChioce==2)
            sleep(30);
        else if (iChioce==3)
            hitdoudou();
        else if (iChioce==0)
            break;
        else
        {
            printf("\007选择错误！\n");
            continue;
        }
        printf("恭喜你完成了一项工作！\n\n");
    }
    while(1);
    return 0;
}

int choose()
{
    int i;
    printf("*请选择：\n");
    printf("*  1. 吃饭\n");
    printf("*  2. 睡觉\n");
    printf("*  3. 打豆豆\n");
    printf("*  0. 退出\n");
    printf("*  请选择（0-3）:");
    scanf("%d", &i);
    return i;
}


void eat(int n, char *food)
{
    printf("我吃了%d斤%s.\n", n, food);
}


void sleep(int m)
{
    printf("我睡了%d分钟. \n", m);
}


void hitdoudou()
{
    static int count = 0;
    count++;
    printf("打了%d次了.\n", count);
}