Table of Contents
Just printing "Hello World" is not exciting, is it? You want to do more than that - you want to be able to do some manipulation of data and get some output just like you would with other commands on your system. We can achieve this using constants and variables.
A literal constant is a number like 5, 1.23, 9.25e-3 or a string like 'This is a string' or "It's a string!" . It is called a literal because it is literal - you use its value literally. The number 2 always represents itself and nothing else. It is a constant because it's value cannot be changed.