| Term | Definition |
|---|
| isalnum | Check if character is alphanumeric (function) |
| isalpha | Check if character is alphabetic (function) |
| iscntrl | Check if character is a control character (function) |
| isdigit | Check if character is decimal digit (function) |
| isgraph | Check if character has graphical representation using locale (function template) |
| islower | Check if character is lowercase letter (function) |
| isprint | Check if character is printable (function) |
| ispunct | Check if character is a punctuation character (function) |
| isspace | Check if character is a white-space (function) |
| isupper | Check if character is uppercase letter (function) |
| isxdigit | Check if character is hexadecimal digit (function) |
| tolower | Convert uppercase letter to lowercase (function) |
| toupper | Convert lowercase letter to uppercase (function) |
Combine with other sets
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