C - <ctype.h>
The C has a number of functions that can be used to classify and transform individual characters. These functions are available to use in a current program after including the header file using - #include <ctype.h>. This header is part of the null-terminated byte strings library. All functions of this header file are listed below:
Library Functions
Character classification functions
| Functions | Description |
|---|---|
| isalnum() | Check if character is alphanumeric. |
| isalpha() | Check if character is alphabetic. |
| isblank() (C99) | Check if character is blank. |
| iscntrl() | Check if character is a control character. |
| isdigit() | Check if character is decimal digit. |
| isgraph() | Check if character has graphical representation. |
| islower() | Check if character is lowercase letter. |
| isprint() | Check if character is printable. |
| ispunct() | Check if character is a punctuation character. |
| isspace() | Check if character is a whitespace. |
| isupper() | Check if character is uppercase letter. |
| isxdigit() | Check if character is hexadecimal digit. |
