Question

Explain why the fallowing variables name are invild 123ABC

Answer 1

Answer:

The 'sum' is valid variable name.

The characters [A-Z], [a-z] or [0-9], $(dollar sign) and _(underscore) in a valid identifier. An identifier should not declare with space. An identifier should not start with a number. An identifier ideally should be of 14-15 characters for appropriate use.

Explanation:

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