I/O Stream or Shift Operators Overloading | C++

#include <iostream> using namespace std; class Data { private: int n, m; public: Data() { n = 0; m = 0; } Data(int n, int m) { this->n = n; this->m = m; } //stuff for ostream operator << ... //stuff for istream operator >> ... }; 

 friend ostream &operator<<(ostream &myout, Data &data) { myout << "n: " << data.n << " m: " << data.m << endl; return myout; } friend istream &operator>>(istream &myin, Data &data) { myin >> data.n; myin >> data.m; return myin; } 

int main() { Data data(5, 7); Data data1; cout << data; cin >> data1; cout << data1; return 0; }