A simple interactive application will make a request (for a number or a Yes/No answer) and respond accordingly. Doing so can be described as a four-step process:
Prompting the user, indicating the type of information requested (Figure 5.1)
Figure 5.1. Letting the user know what type (and often, which format) of information is requested is an important facet of your applications.
Reading the input typed into the keyboard
Validating that the input is of the proper format
Reacting based on the value of the input
This chapter will teach all of these steps from the ground up.
The simplest type of input to be read ...