关于overloading operators的一个基础输出代码

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代码:

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

class output{
public:
friend ostream &operator<<(ostream &output,output param)
{output<<"Hello,world!"<<endl;
return output;}

}


int main()
{output aaa;
cout<<aaa;
system("pause");}

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代码:

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



int main()
{
int operator+(int a, int b){
int c;
c=a*b;
return c;}

system("pause");}