输出运算符重载格式

ostream & operator<<(ostream &out,person a)
{
    cout << a.a << endl;
    return out;
}

举例输出运算符重载

#include "iostream"

using namespace std;
 
class person
{
    public:
    person(int a):a(a){}
    int a;
};


ostream & operator<<(ostream &out,person a)
{
    cout << a.a << endl;
    return out;
}


int main()
{
    person a(10);
    person b(99);
    cout << a << b  ;
}

输入运算符重载格式

istream  & operator>>(istream &in,person &a)
{
    cin>>a.a;
    return in;
}

举例输入运算符重载

#include "iostream"

using namespace std;
 
class person
{
    public:
    person(int a):a(a){}
    int a;
};


ostream & operator<<(ostream &out,person a)
{
    cout << a.a << endl;
    return out;
}

istream  & operator>>(istream &in,person &a)
{
    cin>>a.a;
    return in;
}



int main()
{
    person a(10);
    person b(99);
    cout << a << b;
    cin>>a>>b;
    cout << a << b;
}