object_composotion.go

package main

import "fmt"

type Rectangle struct {
	length, width int
}

func (r *Rectangle) Area() int {
	return r.length * r.width
}

func (r *Rectangle) per() int {
	return 2 * (r.length + r.width)
}

type Square struct {
	rectangle := new(Rectangle) //creating the reference for rectange struct
	length int
}

func (s *Square) Area() int {
	return s.length * s.length
}