/* 程序10.11：英制與數(shù)相加_加號(hào)運(yùn)算符重載.cpp：*/
#include<iostream>		//包含頭文件
#include<string>		//包含頭文件
using namespace std;	//使用名字空間std
class Length			//聲明一個(gè)類Length
{
private:
	int iFeet;			//聲明私有成員變量
	int iInch;
public:
	Length();					//聲明無參數(shù)構(gòu)造符函數(shù)
	Length(int,int);			//聲明有參數(shù)構(gòu)造符函數(shù)
	Length operator+(Length);	//聲明加號(hào)運(yùn)算符函數(shù)
	Length operator+(int);		//聲明加號(hào)運(yùn)算符函數(shù)
	void display(string);		//聲明顯示英制長度函數(shù)
};
int main()				//main()函數(shù)開始
{
	Length L1(3,10);		//聲明類對象L1,調(diào)用有參數(shù)構(gòu)造符
	Length L2(4,6);			//聲明類對象L2,調(diào)用有參數(shù)構(gòu)造符
	cout<<"\n重載operator+()加號(hào)運(yùn)算符函數(shù)前"<<endl;
	L1.display("L1");		//調(diào)用顯示英制長度函數(shù)
	L2.display("L2");		//調(diào)用顯示英制長度函數(shù)
	Length L3;				//聲明類對象L3,調(diào)用無參數(shù)構(gòu)造符
	L3=L1+L2;				//等價(jià)于L1.operator+(L2);
	cout<<"\nL1+L2重載operator+(Length)加號(hào)運(yùn)算符函數(shù)后"<<endl;
	L3.display("L3");			//調(diào)用顯示英制長度函數(shù)
	L3=L3+10;
	cout<<"\nL3+10重載operator+(int)加號(hào)運(yùn)算符函數(shù)后"<<endl;
	L3.display("L3");			//調(diào)用顯示英制長度函數(shù)
	return 0;
}								//main()函數(shù)結(jié)束
Length::Length()				//定義構(gòu)造符函數(shù)
{
	iFeet=0;
	iInch=0;
}
Length::Length(int iFeet,int iInch)		//定義構(gòu)造符函數(shù)
{
	this->iFeet=iFeet;
	this->iInch=iInch;
}
Length Length::operator+(Length N)	//定義加號(hào)運(yùn)算符函數(shù)
{
	cout<<"\n類對象相加運(yùn)算符函數(shù)operator+()被重載"<<endl;
	Length Temp;
	Temp.iFeet=iFeet+N.iFeet;
	Temp.iInch=iInch+N.iInch;
	while(Temp.iInch>=12)
	{
		Temp.iFeet++;
		Temp.iInch-=12;
	}
	return Temp;
}

Length Length::operator+(int iNum)	//定義加號(hào)運(yùn)算符函數(shù)
{
	cout<<"\n類對象與數(shù)相加運(yùn)算符函數(shù)operator+()被重載"<<endl;
	Length Temp=*this;
//	Temp.iFeet=iFeet;
	Temp.iInch=iInch+iNum;
	while(Temp.iInch>=12)
	{
		Temp.iFeet++;
		Temp.iInch-=12;
	}
	return Temp;
}
void Length::display(string s)		//定義顯示英制長度函數(shù)
{
	cout<<s<<" = "<<iFeet<<"\' "<<iInch<<"\" "<<endl;
}