复制构造函数问题

// 13.1.cpp : 定义控制台应用程序的入口点。

//



#include "stdafx.h"

#include <iostream>

#include <string>

#include <cstdlib>

#include <cstdio>



using namespace std;





class SalesItem{

public:

	SalesItem(): isbn(), units_sold( 0 ), revenue( 0.0 ){

	}



	SalesItem( string Isbn, int UnitsSold, double Revenue ) : isbn( Isbn ), units_sold( UnitsSold ), revenue( Revenue ){

	}



	SalesItem( string Isbn ){

		cout<<"using one param function!!!!!!"<<endl;

		isbn = Isbn;

	}



	SalesItem( const SalesItem &item ){

		cout<<"copy init..."<<endl;

	}



private:

	string isbn;

	int units_sold;

	double revenue;

};





int _tmain(int argc, _TCHAR* argv[])

{

	SalesItem s = string("hello");



	return 0;

}