C++ 有关 ATM 系统,怎么使用文件保存上一次的值。
#include<iostream>using namespace std;
#include<windows.h>
static int zong=5000;
class ATM
{
public:
void time();
void denglu();
void zhuyemian();
void djmian();
int cunkuan();
int qukuan();
int chaxun();
void get();
void zhuanzhang();
void tuichu();
};
void ATM::time()
{
cout<<"系统正在处理，请稍候......"<<endl;
}
void ATM::zhuyemian()
{
int A;
cout<<"--------------------------------------------------------------------------"<<endl;
cout<<"\t--- 1:用户登录 ---\t"<<endl;
cout<<"\t--- 2:注销登录 ---\t"<<endl;
cout<<"---------------------------------------------------------------------------"<<endl;
cout<<"请输入你需要的操作(1/2)"<<endl;
cin>>A;
if(A>0&&A<3)
{
switch(A)
{
case 1:denglu();break;
case 2:tuichu();break;
}
}
else
{
cout<<"请输入正确的数字"<<endl;
cin.get();
zhuyemian();
}
}
void ATM::denglu()
{
int id,pw;
cout<<"请输入卡号：";
cin>>id;
if(id>000001&&id<999999)
{
cout<<"请输入密码： ";
cin>>pw;
if(id==pw)
{
cout<<"登录成功，请选择需要办理的业务："<<endl;
djmian();
}
else
{
cout<<"请输入正确的帐号密码"<<endl;
zhuyemian();
}
}
}
void ATM::djmian()
{
int B;
cout<<"--------------------------------------------------------------"<<endl;
cout<<"------\t 1.取款业务 ---------- \t"<<endl;
cout<<"------\t 2.存款业务 ----------- \t"<<endl;
cout<<"------\t 3.查询业务 ----------- \t"<<endl;
cout<<"------\t 4.转账业务 ----------- \t"<<endl;
cout<<"------\t 5.退出系统 ------------ \t"<<endl;
cout<<"--------------------------------------------------------------"<<endl;
cout<<"请输入操作数进行操作： "<<endl;
cin>>B;
if(B>0&&B<6)
{
switch(B)
{
case 1:qukuan();break;
case 2:cunkuan();break;
case 3:chaxun();break;
case 4:zhuanzhang();break;
case 5:tuichu();break;
}
}
else
{
cout<<"请输入正确的操作数： "<<endl;
djmian();
}
}
int ATM::qukuan()
{
int qu;
cout<<"请输入取款的金额： "<<endl;
cin>>qu;
if(qu>zong)
{
cout<<"对不起，你的余额不足..."<<endl;
qukuan();
}
else
{
if(qu%100!=0)
{
cout<<"请输入金额是100的倍数的金额..."<<endl;
qukuan();
}
else
{
zong=zong-qu;
cout<<"取款成功，请收好钱"<<endl;
cout<<"你现在的金额为"<<zong<<endl;
cout<<"请选择其他业务"<<endl;
djmian();
}
}
return 0;
}
int ATM::cunkuan()
{
int cun;
cout<<"清输入存款的金额： "<<endl;
cin>>cun;
if(cun%100!=0)
{
cout<<"请输入金额是100的倍数的金额..."<<endl;
cunkuan();
}
else
{
zong=zong+cun;
cout<<"存款成功，钱已到账."<<endl;
cout<<"你现在的金额为: "<<zong<<endl;
cout<<"请选择其他业务"<<endl;
djmian();
}
return 0;
}
int ATM::chaxun()
{
cout<<"你的余额为："<<zong<<endl;
cout<<"请输入操作数进行操作"<<endl;
djmian();
return 0;
}
void ATM::zhuanzhang()
{
int zh;
int card;
cout<<"请输入转账的卡号:"<<endl;
cin>>card;
if(card>000001&&card<999999)
{
cout<<"请输入转账的金额："<<endl;
cin>>zh;
if(zh%100!=0)
{
cout<<"请输入金额是100的倍数的金额..."<<endl;
zhuanzhang();
}
else
{
cout<<"转账成功，请选择其他操作..."<<endl;
} djmian();
}
else
{
cout<<"请输入正确的卡号..."<<endl;
zhuanzhang();
}
return;
}
void ATM::tuichu()
{
cout<<endl;
cout<<"欢迎下次光临"<<endl;
return ;
}
int main()
{
ATM one;
one.zhuyemian();
return 0;
}
