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What are the Properties of the first argument of a printf() functions?

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What are the Properties of the first argument of a printf() functions?

(a) It is defined by a user

(b) It keeps the record of the types of arguments that will follow

(c) There may no be first argument

(d) None of the mentioned

The question was posed to me in an international level competition.

This interesting question is from Formatted Output in chapter Input and Output in C of C

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Right answer is (b) It keeps the record of the types of arguments that will follow

The explanation is: None.

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