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How many characters for pushback is guaranteed per file while using ungetc(c, fp);?

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How many characters for pushback is guaranteed per file while using ungetc(c, fp);?

(a) Only 1 character

(b) Characters within 1 word

(c) Characters within 1st new-line

(d) All characters upto NULL character

This question was posed to me during an internship interview.

This question is from Ungetc in portion Input and Output in C of C

1 Answer

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Correct answer is (a) Only 1 character

The explanation: None.

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