switch语句解决ATN取款机问题

#include<stdio.h>

int main(int argc, const char *argv[])
{
    int select,del_select;
    int total_money = 1000;
    int add_money;
    int del_money;
    while(1)
    {
        printf("***************************\n");
        printf("1.查询 2.存款 3.取款 0.退卡\n");
        printf("***************************\n");

        scanf("%d",&select);
        switch(select)
        {
        case 1:
            printf("total_money:%d\n",total_money); 
            break;

        case 2:
            printf("请输入存款金额:");
            scanf("%d",&add_money);
            if(add_money % 50 != 0)
            {
                printf("ATM只接收50或100面额\n");
                continue;
            }
            total_money += add_money;
            printf("存款成功\n");
            break;

        case 3:
#if 0
            printf("请输入取款金额:");
            scanf("%d",&del_money);

            total_money -= del_money;
            printf("取款成功\n");
#endif
            printf("***************************\n");
            printf("选择1.100 2.200 3.500 4.1000 5.自定义\n");
            printf("***************************\n");
            scanf("%d",&del_select);
            switch(del_select)
            {
            case 1:
                if(total_money < 100)
                {
                    printf("金额不足\n");
                    continue;
                }
                total_money -= 100;
                break;
            case 2:
                if(total_money < 200)
                {
                    printf("金额不足\n");
                    continue;
                }

                total_money -= 200;
                break;
            case 3:
                if(total_money < 500)
                {
                    printf("金额不足\n");
                    continue;
                }

                total_money -= 500;
                break;
            case 4:
                if(total_money < 1000)
                {
                    printf("金额不足\n");
                    continue;
                }

                total_money -= 1000;
                break;
            case 5:
                printf("请输入需要的取款金额:");
                scanf("%d",&del_money);
                if(del_money > total_money)
                {
                    printf("金额不足\n");
                    continue;
                }
                if(del_money % 50 != 0)
                {
                    printf("只支持50或100面额\n");
                    continue;
                }
                total_money -= del_money;
                break;
            }
            printf("取款成功\n");
            break;
        case 0:
            printf("请选择是否退卡:yes是退出 no不退出\n");
            char choice[5];
            scanf("%s",choice);

            if(strcmp(choice,"yes") == 0)
            {
                printf("退卡成功\n");
                return 0;
            }
            if(strcmp(choice,"no") == 0)
            {
                printf("继续操作\n");
                continue;
            }
        }

    }
    return 0;
}