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Which of the following is not a valid variable name declaration?

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Which of the following is not a valid variable name declaration?

(a) int _a3;

(b) int a_3;

(c) int 3_a;

(d) int _3a

I got this question in an interview for internship.

This question is from Variable Names topic in chapter Data Types, Operators and Expressions in C of C

1 Answer

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Best answer
The correct answer is (c) int 3_a;

Easy explanation - Variable name cannot start with a digit.

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