Scope resolution operator in class

Scope resolution operator in class

#include <iostream>
using namespace std;
 
class programming {
public:
  void output();  //function declaration
};
 
// function definition outside the class 
 
void programming::output() {
  cout << "Function defined outside the class.\n";
}
 
int main() {
  programming x;
  x.output();
 
  return 0;
}