按‘0’退出时有问题，大家帮忙改改~~
#include"stdio.h"
#include"stdlib.h"
void cj();
void ck();
struct human
{
    char name[20];
        char sex[4];
        char jg[10];
        char dz[30];
        char qq[20];
        char tel[20];
}hu[100];
int i=0;
main()
{
    int choice;
    char *p;
    for(;;)
    {
    printf("1.创建联系人\n");
        printf("2.查询联系人\n");
        printf("3.添加联系人\n");
        printf("0.退出！\n");
        scanf("%d",&choice);
        switch(choice)
        {
        case 1: cj();break;
        case 2: ck();break;
        case 3: cj();break;
        case 0: return;
        default:printf("无效输入！！！");
            break;
        }
        printf("真的要退出？（Y/N）?");
        scanf("%c",p);
        if(*p=='y'||*p=='Y')
            break;
        else
            continue;
    }
}
void cj()
{
    printf("请输入联系人姓名：\n");
        scanf("%s",hu[i].name);
    printf("请输入联系人性别：\n");
        scanf("%s",hu[i].sex);
    printf("请输入联系人籍贯：\n");
        scanf("%s",hu[i].jg);
    printf("请输入联系人地址：\n");
        scanf("%s",hu[i].dz);
    printf("请输入qq：\n");
        scanf("%s",hu[i].qq);
    printf("请输入电话：\n");
        scanf("%s",hu[i].tel);
        i++;
}
void ck()
{
    int a;
    printf("查看几号联系人：\n");
    scanf("%d",&a);
    if(i>0&&a<i)
    {
        printf("%d号联系人:\n",a);
        printf("姓名:%s\n",hu[a].name);
        printf("性别:%s\n",hu[a].sex);
        printf("籍贯:%s\n",hu[a].jg);
        printf("地址:%s\n",hu[a].dz);
        printf("QQ:%s\n",hu[a].qq);
        printf("电话:%s\n",hu[a].tel);
    }
        else
        printf("无此联系人！！！");
   
}



[ 本帖最后由 human84 于 2010-1-4 23:43 编辑 ]

这个太多余了。没必要。

printf("真的要退出？（Y/N）?");//加个getchar();
        scanf("%c",p);
        if(*p=='y'||*p=='Y')
            break;
        else
            continue;
    }