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ctype.h - ctype.h
The ctype header is used for testing and converting characters. A control character refers to a character that is not part of the normal printing set. In the ASCII character set, the control characters are the characters from 0 (NUL) through 0x1F (US), and the character 0x7F (DEL). Printable characters are those from 0x20 (space) to 0x7E (tilde).

Functions:

isalnum();
isalpha();
iscntrl();
isdigit();
isgraph();
islower();
isprint();
ispunct();
isspace();
isupper();
isxdigit();
tolower();
toupper();

 

 
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