Identifiers :- Identifiers refer to the names of variables, functions, arrays, structures etc. These are user-defined names and consist of a sequence of letters and digits. Both uppercase and lowercase letters are permitted, although lowercase letters are commonly used. The underscore character is also permitted in identifiers. It is usually used as a link between two words in long identifiers.
Rules for identifiers
- First character must be an alphabet or underscore.
- Must consist of only letters, digits or underscore
- Only first 31 characters are significant.
- Can't use a keywords.
- Must not contain white space and spacial symbols.
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