I am trying to understand several programs in my class can s

I am trying to understand several programs in my class.

can someone explain the lines of code

Rectangle(float h, float w):height(h),width(w)

AND

Square(float side): Rectangle(side,side) {} ?

Thanks!   

class Rectangle {

public:

Rectangle(float h, float w):height(h),width(w){

}

float height, width;

};

class Square : public Rectangle{

public:

Square(float side): Rectangle(side,side) {}

};

Solution

#include<iostream>
using namespace std;

//Rectangle class
class Rectangle
{
   //private data members
   float height, width;
public:
   //Constructor that takes h and w as sarguments
   //set values of h and w to private variables of
   //this class height and width
   Rectangle(float h, float w):height(h),width(w)
   {
   }
};

//Square class that inherits from Rectangle
class Square : public Rectangle
{
public:
   //The constructor Square that takes side as input arguments
   //and pass the argument to its parent class Rectangle both arguments with
   //side value
   Square(float side): Rectangle(side,side)
   {}

};

//Sample main method to demonstrate the use of Rectangel and Square class
void main()
{

   //create an object of Rectangle class with height=1 and width=2
   Rectangle r(1,2);
   //create an object of Square class with side=1
   //The object inturn calls the rectangle class to set width and height with side value=1
   Square s(1);

   system(\"pause\");
}