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function tolower(c) defined in library <ctype.h> works for ___________

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function tolower(c) defined in library <ctype.h> works for ___________

(a) Ascii character set

(b) Unicode character set

(c) Ascii and utf-8 but not EBCDIC character set

(d) Any character set

I have been asked this question in an interview for internship.

The origin of the question is Type Conversions topic in chapter Data Types, Operators and Expressions in C of C

1 Answer

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Best answer
The correct choice is (d) Any character set

To explain I would say: None.

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