Classification functions
|
isalnum
| Is character alphanumeric? |
isalpha
| Is character alphabetic? |
isblank
| Is character a space or horizontal tab? |
iscntrl
| Is character a control character? |
isdigit
| Is character a decimal digit? |
isgraph
| Is character any printing character except space? |
islower
| Is character a lowercase letter? |
isprint
| Is character printable? |
ispunct
| Is character a punctuation mark? |
isspace
| Is character a whitespace character? |
isupper
| Is character an uppercase letter? |
isxdigit
| Is character a hexadecimal digit? |
Conversion functions
|
tolower
| Convert uppercase character to lowercase |
toupper
| Convert lowercase character to uppercase |