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What does scanf() function return?

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What does scanf() function return?

(a) Number of successfully matched and assigned input items

(b) Nothing

(c) Number of characters properly printed

(d) Error

The question was asked in my homework.

My question is based upon Formatted Input in chapter Input and Output in C of C

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The correct option is (a) Number of successfully matched and assigned input items

The explanation is: None.

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