Chapter 5 Variables and Constants
5.1 What is a Variable?
In computer science, a variable is a location in the computer's main memory (RAM) where a program can store a value and change it as the program executes.
Picture a variable as a transparent box in which you can insert and hold one thing at a time. Because the box is transparent, you can also see what it contains. Also, if you have two or more boxes you can give each box a unique name. For example, you could have three boxes, each containing a different number, and you could name the boxes numberA, numberB, and numberC.
The boxes named numberA, numberB and numberC in the example contain ...
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