Slip 20 - A) Create a C++ class Number with integer data member. Write necessary member functions to overload the operator unary pre and post increment ‘++’.

Solution:

#include <iostream>

using namespace std;

class Number

{

    private:

       int i;

    public:

       Number() {  }

       Number(int num)

       {

            i=num;

   }

       Number operator ++() 

        { 

              ++i;

    return *this; 

        }

        Number operator ++(int )

        {

          Number temp=*this;

          i++;

          return temp;

}

       void Display() 

        { 

            cout << "i=" << i << endl; 

        

        }

};

int main()

{

    Number obj(5),obj1(5);

    cout<<"Original Number = "<<endl;

    obj.Display();

    ++obj; 

    cout<<"After pre-increment number is = "<<endl;

    obj.Display();

    obj1++;

    cout<<"After post-increment number is = "<<endl;

    obj1.Display();

    return 0;

}