C Language: Standard Library Functions - ctype.h
In the C Programming Language, the Standard Library Functions are divided into several header files.
The following is a list of functions found within the <ctype.h> header file:
Character Testing functions
| isalnum | Test for Alphanumeric |
| isalpha | Test for Alphabetic |
| iscntrl | Test for Control Character |
| isdigit | Test for Digit |
| isgraph | Test for Graphical Character (does not include a space) |
| islower | Test for Lowercase Letter |
| isprint | Test for Printing Character (does include a space) |
| ispunct | Test for Punctuation Character |
| isspace | Test for White-Space Character |
| isupper | Test for Uppercase Letter |
| isxdigit | Test for Hexadecimal Digit |
Character Case-Mapping functions
| tolower | Convert to Lowercase |
| toupper | Convert to Uppercase |
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