A variable serves two purposes. It provides you with a way of referring to particular information, and also reserves the amount of memory necessary to store that information.

You must create a variable before you can start using it. You create a variable by declaring it. You may declare multiple variables of the same type in one statement.

You can use the address operator, &, to determine the address of a variable, and the sizeof operator to determine the size of a variable.

The purpose of a variable is to store information. Therefore, after you have created a variable, the next logical step is to specify the information that the variable will store. This is called assigning a value to a variable.

A variable can be assigned a value either by the programmer in code or by the user, usually via the keyboard, when the program is running. You use the assignment operator to assign a value supplied by code. You use the cin object to assign a value supplied by the user .

In the next chapter, you will learn how to use variables to perform arithmetic.

C++ Demystified(c) A Self-Teaching Guide
C++ Demystified(c) A Self-Teaching Guide
ISBN: 72253703
Year: 2006
Pages: 148 © 2008-2017.
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