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Which types of input are accepted in toupper(c)?

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Which types of input are accepted in toupper(c)?

(a) char

(b) char *

(c) float

(d) Both char and char *

The question was posed to me during an internship interview.

The doubt is from Character Class Testing & Conversions in section Input and Output in C of C

1 Answer

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Best answer
The correct answer is (a) char

The explanation: None.

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