C Language Programming Library Reference Guide

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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