07d2.cpp

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/*
NIIT 《C++ & CGI PROGRAMMING &SCRRIPTING》 Skill Base
教材P7.9	7.D.2
审核：周永 [e-mail]	23:53 2004-10-18
测试环境：Microsoft Windowsn 2000(VC++)；Red Hat Linux 7.3；Red Hat Linux 9.0
*/

#include <iostream.h>
class Number
{
private:
	int number;
public:
	friend Number operator +(int, const Number &);  //Operation 
	Number(int = 0); //Constructor 
	void display();
};

Number::Number(int num) 
{
	number = num;
}

void Number :: display()
{
	cout << number << endl;
}

Number operator +(int left, const Number &objRHS)
{
	Number temp;
	temp.number =  left + objRHS.number;
	return temp;
}

int main()
{
	Number num1(100);
	Number tot;
	tot = 50 + num1;
	tot.display(); 	//Displays 150
	return 0;
}