Question

Which function is used to check whether a character is an alphabet or number?

(a) isalpha()

(b) isalnum()

(c) isdigit()

(d) isblank()

This question was addressed to me during an online interview.

The doubt is from Character Classification topic in section Types, Pointers, Arrays & Structures in C++ of C++

Answer 1

The correct choice is (b) isalnum()

The explanation is: Character classification provides isalnum() function to check whether a character in C++ is alphabet or number.