productclassaddition2.cpp

来自「C++ sample code, for the book: C++ blac」· C++ 代码 · 共 50 行

#include <iostream>
#include <string>
using namespace std;

class product 
{     
    int number;        
public:         
    string name;              
    int get_number(){return number;}
    void set_number(int n){number = n;}
    product(int count);
    product(string text, int count);
    friend product operator+(int n, const product & product2);
};

product::product(int count)
{
    number = count;
}

product::product(string text, int count)
{
    name = text;
    number = count;
}

product operator+(int n, const product & product2)
{
    product temp("", 0);
    temp.name = product2.name;
    temp.set_number(n + product2.number);
    return temp;           
}

main()
{
    product apples("apples", 300);
    
    apples = 5 + apples;

    cout << "Number of " << apples.name << ": " 
        << apples.get_number() << endl;

    return 0;
}