【带头学C++】----- 九、类和对象 ---- 9.13 运算符重载—

【带头学C++】----- 九、类和对象 ---- 9.13 运算符重载——（9.13.5-9.13.7）

本文主要是介绍【带头学C++】----- 九、类和对象 ---- 9.13 运算符重载——（9.13.5-9.13.7），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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9.13.5 重载+运算符(全局函实现)

上节实现了<<、>>输入输出运算符重载，那么我们怎么实现下面这样的情况呢？

这里就是上一节我们输出的时候，第二参数传的是引用类型。

结果：

代码：

#include <iostream>
#include <string>
#include "array.h"using namespace std;
class Person
{friend ostream& operator<<(ostream &out,Person ob);friend istream& operator>>(istream &in,Person &ob);friend Person operator+(Person &ob1,Person &ob2);
private:int num;string name;float score;
public:Person(){}Person(int num,string name,float score):num(num),name(name),score(score){}
};
//全局函数重载operator<< 输出运算符
ostream& operator<<(ostream &out,Person ob){out<<ob.num<<" "<<ob.name<<" "<<ob.score<<endl;return out;
}
//全局函数重载operator>> 输入运算符
istream& operator>>(istream &in,Person &ob){in>>ob.num>>ob.name>>ob.score;return in;
}
//全局函数重载+运算符
Person operator+(Person &ob1,Person &ob2){Person tmp;tmp.num   = ob1.num+ob2.num;tmp.name  = ob1.name+ob2.name;tmp.score = ob1.score+ob2.score;return tmp;
}
int main()
{Person Jery{101,"Jery",99.9f};Person Tom{102,"Tom",98.9f};cout<<Jery+Tom<<endl;return 0;
}

9.13.6 重载+运算符(成员函数实现推荐)

代码：

#include <iostream>
#include <string>
#include "array.h"using namespace std;
class Person
{friend ostream& operator<<(ostream &out,Person ob);friend istream& operator>>(istream &in,Person &ob);//friend Person operator+(Person &ob1,Person &ob2);
private:int num;string name;float score;
public:Person(){}Person(int num,string name,float score):num(num),name(name),score(score){}//成员函数实现重载加法运算符Person operator+(Person &ob){Person tmp;tmp.num = num + ob.num;tmp.name = name + ob.name;tmp.score = score + ob.score;return tmp;}};
//全局函数重载operator<< 输出运算符
ostream& operator<<(ostream &out,Person ob){out<<ob.num<<" "<<ob.name<<" "<<ob.score<<endl;return out;
}
//全局函数重载operator>> 输入运算符
istream& operator>>(istream &in,Person &ob){in>>ob.num>>ob.name>>ob.score;return in;
}
int main()
{Person Jery{101,"Jery",99.9f};Person Tom{102,"Tom",98.9f};//Jery + Tom  ==> Jery.operator+(Tom)//cout<<Jery+Tom<<endl;cout << Jery.operator+(Tom) <<endl;return 0;
}