C TutorialLesson 7Free preview

C Variables

This lesson is part of C · All levels

Summary

A variable is a named container for storing data that can change during the program's run. In C each variable must be declared by including its data type, e.g. int for integers or char for one character. The name of the variable should begin with a letter or underscore, should not precede a number, and should be used to give a clear meaning to the data. The value of a variable can be changed at any time during program execution.

Key points

The declaration of variable C always includes data types, for example: int age;
The name of the variable can only contain letters, numbers, and underscores, without the number prefix
C is case-sensitive so the value and the value are different variables
New variables should always be given a starting value before use to avoid a waste value

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