C++primer plus第六版课后编程题答案10.1
bank.h
#ifndef bank_H_
#define bank_H_
#include <string>
using namespace std;
class Bank{
private:
string name;
string account;
double money;
void setIn(double in){money+=in;};
void setOut(double out){money-=out;};
double getMoney(){return money;};
public:
Bank(string n,string a,double m);
~Bank();
//void show(const bank &b);
void in(double input);
void out(double output);
friend ostream&operator<<(ostream &os,const Bank &b);//友元函数
};
#endif
bank.cpp
#include <iostream>
#include "bank.h"
Bank::Bank(string n,string a,double m){
name=n; //怎么第一次编译老是提示我构造函数不能有返回值?
account=a;
money=m;
std::cout<<"\nBankaccount success!"<<endl;
}
/*
Bank::Bank(string n,string a,double m)
{
name=n;
account=a;
money=m;
std::cout<<"Success!"<<endl;
}*/
Bank::~Bank()
{
std::cout<<"\nBankaccount recevory!"<<endl;
}
void Bank::in(double input)
{
Bank::setIn(input);
}
void Bank::out(double output)
{
if(Bank::getMoney()>0)
Bank::setOut(output);
else
std::cout<<"\nYour have not enough money!"<<endl;
}
std::ostream &operator<<(ostream &os,const Bank &b)//重载<<运算符
{
os<<"\nshow start!"<<endl;
os<<"name:"<<b.name<<" account:"<<b.account<<endl;
os<<"money:"<<b.money<<endl;
return os;
}
main101.cpp
#include <iostream>
#include "bank.h"
using namespace std;
void main101()
{
{ //将其加入代码块是为了更好地查看对象的销毁过程
Bank b1=Bank("guang","a1",100);
Bank b2=Bank("jing","a2",600.5);
cout<<b1<<endl;
cout<<b2<<endl;
//b1.money=200;
b1.in(100);
cout<<b1<<endl;
b1.out(5.5);
cout<<b1<<endl;
}
system("pause");
}
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