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This video tutorial explains how to define operator function outside the class definition using scope resolution operator and also explains how to overload minus operator in c++.
You are gonna learn how to use scope resolution operator with operator function, how to overload minus operator outside class definition in detail with example.

source code for this tutorial

#include 

using namespace std;

class Marks{
int intmark;
int extmark;
public:
    Marks(){
    intmark = 0;
    extmark = 0;
    }
   Marks( int im,int em){
    intmark =im;
    extmark = em;
    }
    void display(){
    cout << intmark<