Identifiers

C programming, identifiers are user-defined names used to identify variables, functions, arrays, structures, labels, and other program entities. Identifiers serve as a way to give meaningful names to various elements in your code. Here are some rules for naming identifiers in C.

Valid Characters: An identifier can consist of letters (both uppercase and lowercase), digits, and underscores (_). It must start with a letter or an underscore.

Case Sensitivity: C is a case-sensitive language, so uppercase and lowercase letters are considered distinct. For example, count and Count are treated as different identifiers.

Reserved Keywords: You cannot use reserved keywords (such as int, for, if, etc.) as identifiers, as they have predefined meanings in the language.

Length Limitation: The length of an identifier may vary depending on the compiler, but typically it can be up to 31 characters. However, only the first 31 characters are significant; the rest are ignored.

Meaningful Names: It is good practice to choose meaningful and descriptive names for identifiers to enhance code readability and maintainability.