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What is the default return-type of getchar()?

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What is the default return-type of getchar()?

(a) char

(b) int

(c) char *

(d) reading character doesn’t require a return-type

I had been asked this question by my college professor while I was bunking the class.

I need to ask this question from Standard Input & Output topic in chapter Input and Output in C of C

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The correct option is (b) int

Best explanation: None.

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