《C++语言基础》程序阅读——运算符重载（一）

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//(1)

#include <iostream>
using namespace std;
class Sample
{
private:
    int x;
public:
    Sample () { }
    Sample(int a){x=a;}
    void disp(){cout<<"x="<<x<<endl;}
    friend Sample operator+( Sample &s1, Sample &s2);
};
Sample operator+( Sample &s1, Sample &s2)
{
    return Sample(s1.x+s2.x);
} 
 
int main()
{
    Sample obj1(10);
    Sample obj2(20);
    Sample obj3;
    obj3=obj1+obj2;
    obj3.disp();
    return 0;
}

#include <iostream>
using namespace std;
class Sample
{
private:
    int x;
public:
    Sample() {}
    Sample (int a){x=a;}
    void disp(){cout<<"x="<<x<<endl;}
    Sample operator+(Sample &s);
};
Sample Sample:: operator+( Sample &s)
{
    return Sample(x+s.x);
}
int main()
{
    Sample obj1(20);
    Sample obj2(20);
    Sample obj3;
    obj3=obj1+obj2;
    obj3.disp();
    return 0;
}

#include<iostream>
using namespace std;
class Wages//“工资”类
{
    double base;//基本工资
    double bonus;//奖金
    double tax;//税金
public:
    Wages(double CBase, double CBonus,double CTax):
  base(CBase), bonus(CBonus),tax(CTax) {}
    double getPay()const;//返回应付工资额
    Wages operator+(Wages w)const;//重载加法
};
double Wages::getPay()const
{
    return base+bonus-tax;
}
Wages Wages::operator+(Wages w)const
{
    return Wages(base+w.base, 
        bonus+w.bonus,tax+w.tax);
}
int main()
{
    Wages wl(2000,500,100),w2(5000,1000,300);
    cout<<(wl+w2).getPay()<<endl;
    return 0;
}

#include<iostream>
using namespace std;
class Pair
{
    int m;
    int n;
public:
    Pair(int i, int j):m(i),n(j) {}
    bool operator >(Pair p) const; 
};
bool Pair::operator>(Pair p)const
{
    if (m!=p.m) 
        return m>p.m;
    return n>p.n;
}
int main()
{
    Pair p1(3,4),p2(4,3), p3(4,5);
    cout<<(p1>p2)<<(p2>p1)<<(p2>p3)<<(p3>p2);
    return 0;
}