程序代码：

void diancai()
{
    system("cls");
    char  num[50], name[50], money[50];
    int n; char ch[2]; int sum;
    FILE * fp;
    fp = fopen("zengjia_c.txt", "r");
    rewind(fp);                            
    while (!feof(fp))                       
    {                                                                   
        fscanf(fp, "%s%s%s\n", num, name, money);
        printf("%s\t\t\t%s\t\t\t%s\n", num, name, money);
    }
    printf("是否点菜（Y/N）");
    scanf("%s", ch);
    while (strcmp(ch, "Y") == 0 || strcmp(ch, "y") == 0){
        printf("请输入要选择的菜的编号：");
        scanf("%s", num);
        printf("请输入要选择的菜的数量：");
        scanf("%d", &n);
        printf("是否继续点菜（Y/N）");
        scanf("%s", ch);
    }
    sum=
}