Question

The________function converts an uppercase letter to the corresponding lowercase letter.

(a) islower()

(b) isupper()

(c) toupper()

(d) tolower()

The question was asked by my school teacher while I was bunking the class.

I want to ask this question from Character Handling topic in chapter String Operations in C of C

Answer 1

Right choice is (d) tolower()

Best explanation: If the argument is a character for which isupper() is true and  islower() is true for another set of character, the tolower() function returns the corresponding character;otherwise, the argument is returned unchanged.