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 |