Ninja_5

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Overview

Hands-on exercise #5

create a type SQUARE  --means create a struct
create a type CIRCLE
attach a method to each that calculates AREA and returns it
	circle area= π r 2
	square area = L * W
create a type SHAPE that defines an interface as anything that has the AREA method
create a func INFO which takes type shape and then prints the area
create a value of type square
create a value of type circle
use func info to print the area of square
use func info to print the area of circle

code: https://play.golang.org/p/NGGikHNvHv