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");


}