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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 __3a;

(c) int __A3;

(d) None of the mentioned

I got this question during an online interview.

My doubt is from Variable Names in chapter Data Types, Operators and Expressions in C of C

1 Answer

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Best answer
Correct choice is (d) None of the mentioned

The best explanation: None.

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