Question

explain the different rules of valid identificer​

Answer 1

Each identifier must have at least one character. The first character must be picked from: alpha, underscore, or dollar sign. ... The rest of the characters (besides the first) can be from: alpha, digit, underscore, or dollar sign. In other words, it can be any valid identifier character.

Answer 2

Answer:

Syntax of an Identifier

Each identifier must have at least one character. The first character must be picked from: alpha, underscore, or dollar sign. ... The rest of the characters (besides the first) can be from: alpha, digit, underscore, or dollar sign. In other words, it can be any valid identifier character.