An Identifier is a user-defined name given to a variable, function, class, object, array, structure, or any other program element.
In simple words: An identifier is the name used by the programmer to identify a program element.
| Identifier | Valid? | Reason |
|---|---|---|
age | ✅ | Starts with a letter |
studentName | ✅ | Letters only |
_count | ✅ | Starts with _ |
marks123 | ✅ | Ends with digits |
total_marks | ✅ | Underscore allowed |
A1 | ✅ | Letter followed by digit |