Variables and rule for constructing variables in C

Variables and rule for constructing variables in C

VARIABLES

• A variable is a data name that may be used to store a data value and which can be changed during the execution of the program.
• A variable may take different values at different times during execution.
• A variable name can be chosen by the programmer in a meaningful way so as to reflect its function or nature in the program. Example: Average, sum, Total, Answer, number etc.

Rules for constructing variable in C

The following are the rules for variable naming

1. They must begin with a letter. Some system permits underscore as the first character.
2. ANSI standard recognizes a length Of 31 characters. However, the length should not be normally more than eight characters, since only the first eight characters are treated as significant by many compilers.
3. Uppercase and lowercase are significant. That is Total is not the same as total or TOTAL.
4. It should not be a keyword(like int, float).
5. White space is not allowed.

Examples of variable names

Video tutorial: