用C语言编写简化版银行系统：ATM取款机

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#include <stdio.h>
#include <stdlib.h>
/*
*csdn学院--2016级
*目的：让代码见证成长(作为一个初学的菜鸟，如
*大家有发现错误，欢迎指正！)
*文件名称:BankSystemProject1.c
*问题描述:c语言开发简化版银行系统
*作者:小臣小仁
*完成日期:2020年2月15日
*/
int main()
{
    int iPass;          //用户输入密码
    int iPassinfile;    //文件密码
    int try = 0;        //尝试次数
    int iChoice;        //业务选择
    int iMoney;         //银行余额
    int iDrawMoney;     //存钱
    int iDepositMoney;  //取钱
    int iNewPass1,iNewPass2;      //新密码校对
    FILE *fp;
    /*-----------打开存款金额文件--------------*/
    if((fp = fopen("DrawMoney.txt","r")) == NULL)
    {
        printf("File cannot open!");
        exit(0);
    }
    fscanf(fp,"%d",&iMoney);
    fclose(fp);
    /*-----------打开保留密码文件--------------*/
    if((fp = fopen("PassWord.txt","r")) == NULL)
    {
        printf("File cannot open！");
        exit(0);
    }
    fscanf(fp,"%d",&iPassinfile);
    fclose(fp);
    printf("欢迎光临CSDN银行n");

    /*----------银行密码核对-----------*/
    do
    {
        try++;
        printf("请输入密码n");
        scanf("%d",&iPass);
        if(iPass != iPassinfile)
        {
            if(try < 3)
            {
                printf("您已经输入%d次密码n",try);
            }
            else
            {
                printf("密码有误，将退出系统n");
                exit(0);
            }
        }
        else
            break;
    }while(1);

/*-------------银行业务办理----------------*/
    do
    {
        printf("你可以办理以下业务n");
        printf("1.查询n");
        printf("2.取款n");
        printf("3.存款n");
        printf("4.修改密码n");
        printf("0.退出n");
        printf("请输入0~4n");
        scanf("%d",&iChoice);
        switch(iChoice)
        {
        case 1://查询
            printf("你的余额有:n%d",iMoney);
            break;
        case 2://取款
            printf("请输入取款金额:n");
            scanf("%d",&iDrawMoney);
            if(iMoney > iDrawMoney)
            {
                iMoney -= iDrawMoney;
                printf("取款成功n");
            }
            else
                printf("余额不足，取款失败n");
            break;
        case 3://存款
            printf("请输入存款金额:n");
            scanf("%d",&iDepositMoney);
            iMoney += iDepositMoney;
            printf("取款%d元。余额为:%dn",iDepositMoney,iMoney);
            break;
        case 4://修改密码
            printf("请输入新密码：n");
            scanf("%d",&iNewPass1);
            printf("请重新输入密码n");
            scanf("%d",&iNewPass2);
            if(iNewPass1 == iNewPass2)
            {
                printf("修改成功n");
                iPass = iNewPass1;
            }
            else
                printf("密码两次输入不一样，修改失败n");
            break;
        case 0://退出
            break;
        }

    }while(iChoice);

    /*------------保存金额-----------*/
    if((fp = fopen("DrawMoney.txt","w")) == NULL)
    {
        printf("File cannot open!n");
        exit(0);
    }
    fprintf(fp,"%d",iMoney);
    fclose(fp);

    /*-----------保存密码-------------*/
     if((fp = fopen("PassWord.txt","w")) == NULL)
    {
        printf("File cannot open!n");
        exit(0);
    }
    fprintf(fp,"%d",iPass);
    fclose(fp);
    return 0;
}