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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 <iostream>

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<<endl<<extmark<<endl;
    }

    Marks operator+(Marks m){
        Marks temp;
        temp.intmark = intmark + m.intmark;
        temp.extmark = extmark + m.extmark;
        return temp;

    }

    Marks operator-(Marks m);

};

Marks Marks :: operator-(Marks m){
        Marks temp;
        temp.intmark = intmark - m.intmark;
        temp.extmark = extmark - m.extmark;
        return temp;

}


int main()
{
   Marks m1(10,20),m2(30,40);

   Marks m3 = m1 + m2;

   Marks m4 = m2 - m1;
   m3.display();
   m4.display();

    return 0;
}