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Which of the following library function is not case-sensitive?

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Which of the following library function is not case-sensitive?

(a) toupper()

(b) tolower()

(c) isdigit()

(d) all of the mentioned

The question was asked during an interview for a job.

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

1 Answer

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Best answer
Right option is (c) isdigit()

Best explanation: None.

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