Pointer to Classes Example in C++

This program defines a class named Rectangle that has two public member variables length and breadth and two member functions area() and perimeter(). The area() function returns the area of the rectangle and the perimeter() function returns the perimeter of the rectangle.

In the main() function, an instance of the Rectangle class named r is created and its length and breadth values are set to 5 and 10, respectively. Then, the area() function of the r object is called and its return value is printed to the console using the cout statement.

Source Code

#include<iostream>
using namespace std;
class Rectangle
{
public :
    int length;
    int breadth;
    int area()
    {
        return length*breadth;
    }
    int perimeter()
    {
        return 2*(length+breadth);
    }
};
int main()
{
    Rectangle r;
    r.length=5;
    r.breadth=10;
    cout<<"Area : "<<r.area();
    return 0;
}

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Output

Stack Area : 50Heap Area : 100

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