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今天对银行系统进行了修改终于修改好了。下面是我今天忙了一大早的成果。大家看看吧。

#include<iostream>

using namespace std;class Account{friend class CheckingAccount;protected:double balance;  //账户余额public:Account(double Balanc);void credit();//向当前余额加钱int debit();//从账中取钱int getBalance();//返回balance值};Account::Account(double Balance){  balance=Balance;}void Account::credit(){int save; cout<<"您的银行可用余额为:"<<balance<<endl; cout<<"请输入您要存入的金额:"<<endl; cin>>save; balance=balance+save; cout<<"存入后的余额为:"<<endl; cout<<balance<<endl;}int Account::debit(){ int demand;int flag=1; cout<<"请输入您要取出的金额:"<<endl; cin>>demand; if(demand>balance) {balance=balance; cout<<"对不起！您的余额不足,请充值:"<<endl; } else { balance=balance-demand;   cout<<"您已成功取出"<<demand<<"元现金"<<endl;   cout<<"您的余额为"<<getBalance()<<endl;;   //cout<<"您的余额为"<<balance<<endl;   flag=0;//表示钱已被取走 }  return flag;}int Account::getBalance(){ return balance;}class SavingAccount:public Account{friend class CheckingAccount;//下面的CheckingAccount中会用到//SavingAccount中的caclculateInterestprivate://double balance;double interestrate;//账户的比例public:SavingAccount(double Balance,double Interestrate);int caclculateInterest();};SavingAccount::SavingAccount(double Balance,double Interestrate):Account(Balance){balance=balance; interestrate=Interestrate; //credit();//存 //debit();//取}int SavingAccount::caclculateInterest(){double money;money=balance*interestrate;return money;//利息}class CheckingAccount:public SavingAccount{private:double fare;//表示每笔的费用public:CheckingAccount(double Balance,double Interestrate,double Fare);void rescredit();int resdebit();};CheckingAccount::CheckingAccount(double Balance,double Interestrate,double Fare):SavingAccount(Balance,Interestrate){balance=Balance;interestrate=Interestrate;  fare=Fare;}/*void CheckingAccount::rescredit(){ credit(); //caclculateInterest(); int save; cout<<"请输入您要存入的金额:"<<endl; cin>>save; balance=balance+save;}*/int CheckingAccount::resdebit(){bool flag; //credit(); //debit(); if(debit()==0) {cout<<"您已成功提出钱！:"<<endl;balance=balance-fare;cout<<"取钱收取费用!"<<endl;  cout<<"收取的费用后余额产生的利息:"<<caclculateInterest()<<endl; } elsecout<<"收费不成功:"<<endl; return balance;}void main(){cout<<"************欢迎您使用张新华银行系统************"<<endl;cout<<"***********************************"<<endl; Account A1(100); A1.credit();A1.debit();A1.getBalance(); cout<<"***********************************"<<endl; SavingAccount S1(A1.getBalance(),0.2); S1.credit(); S1.debit(); S1.getBalance(); cout<<"账户的利息:"<<S1.caclculateInterest()<<endl;  cout<<"***********************************"<<endl;  CheckingAccount C1(S1.getBalance(),0.2,30); C1.credit(); //C1.debit(); cout<<"收取费用后的余额:"<<C1.resdebit();}

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