I. CTYPE
This library includes some common routines for checking and converting character values.
- Table of Contents
- isalnum — tests for alphabetic or numeric characters
- isalpha — tests for alphabetic characters
- isascii — tests for ASCII characters
- iscntrl — tests for control characters
- isdigit — tests for digit characters
- islower — tests for lower-case characters
- isupper — tests for upper-case characters
- isxdigit — tests for hexadecimal digits
- toascii — converts a character to
ASCII
- tolower — converts an upper-case character to lower-case
- toupper — converts a lower-case character to upper-case