Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking with Code, Third Edition

Exercise 5. More Variables and Printing

Now we’ll do even more typing of variables and printing them out. Every time you put " (double-quotes) around a piece of text you have been making a string. A string is how you make something that your program might give to a human. You print strings, save strings to files, send strings to web servers, and many other things.

Strings are really handy, so in this exercise you will learn how to make strings that have variables embedded in them. You embed variables inside a string by using a special #{} sequence and then put the variable you want inside the {} characters. This tells Ruby, “Hey, this string needs to be formatted. Put these variables in there.”

As usual, just type this in (even if you do not ...