What are the rules for naming a function?

The rules for naming a function are a lot like rules for naming a variable: They must start with a letter or an underscore: _. They should be lowercase. They can have numbers. They can be any length (within reason), but keep them short. They can’t be the same as a Python keyword. Click to see full answer. In this way, how do you name a function?8 Answers. One of the more universal, yet simple rules is: Function names should be verbs if the function changes the state of the program, and nouns if they’re used to return a certain value. One more important thing to do when writing a library is to use the same word to describe the same action every time.Secondly, how long should function names be? General rule is that the function name provides a very short description of what it’s doing. Most of such descriptions should easily fit within 32 characters. (Use CamelCase to separate words.) Since most IDE’s now provide Code Completion, making errors with function names does tend to be rare. Also know, what are the rules in naming variables? Rules for naming variables: All variable names must begin with a letter of the alphabet or an. underscore( _ ). After the first initial letter, variable names can also contain letters and numbers. Uppercase characters are distinct from lowercase characters. You cannot use a C++ keyword (reserved word) as a variable name. What are the rules for naming identifiers in C? Rules for an Identifier An Identifier can only have alphanumeric characters(a-z , A-Z , 0-9) and underscore( _ ). The first character of an identifier can only contain alphabet(a-z , A-Z) or underscore ( _ ). Identifiers are also case sensitive in C. For example name and Name are two different identifiers in C.