C's variable name don't take it anywhere

C advocates the use of variable names of a certain meaning. There are several simple C naming conventions that you must follow:

© only alphabetic characters, math and underscores (_) can be used in names

© the first character of a name cannot be a number

© distinguishing between uppercase and lowercase characters

© You cannot use the C keyword as a name

© names that begin with two underscores or underscores and uppercase letters are reserved for implementation. Names that begin with an underscore are persisted to the implementation, and are used as global identifiers

©c there is no limit to the length of a name, all characters in the name have meaning.

C's variable name don't take it anywhere