Multiple choice general knowledge science & technology

The library function isalpha( ) requires the header file?

  1. <ctype.h>

  2. <math.h>

  3. <time.h>

  4. <stdlib.h>

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A Correct answer
Explanation

The library function isalpha() requires the header file . This header file contains function prototypes for character testing functions like isalpha(), isdigit(), isalnum(), etc. The header is for mathematical functions, for time-related functions, and for general utility functions.