C++ this pointer

///This pointer
#include <bits/stdc++.h>
using namespace std;
class fun{
private:
    int a , b;
public:
    void set (int a , int b)
    {
       this -> a = a;
       this -> b = b;
    }
    int area ()
    {
        return a * b;
    }
};
int main()
{
    fun obj;

    obj.set(1 ,2);

    cout<<obj.area();
}