writing class in c++ code example

Example 1: how to write a class in c++

class Rectangle 
{
	int width, height;
public:
	void set_values (int,int);
    int area() {return width*height;}
};

void Rectangle::set_values (int x, int y)
{
	width = x;
	height = y;
}

Example 2: class cpp

class Exemple
{
  private:
  	/* data */
  public:
  	Exemple(); //Constructor
  	~Exemple(); //Destructor
};