Imagecraft c compiler and development environment for the atmel avr

ICCV8 for AVR – C Compiler for Atmel AVRCharacter Type FunctionsThe following functions categorize input according to the ASCII character set. Use#include > before using these functions. int isalnum(int c)returns non-zero if c is a digit or alphabetic character. int isalpha(int c)returns non-zero if c is an alphabetic character. int iscntrl(int c)returns non-zero if c is a control character (for example, FF, BELL, LF). int isdigit(int c)returns non-zero if c is a digit. int isgraph(int c) )returns non-zero if c is a printable character and not a space. int islower(int c)returns non-zero if c is a lower-case alphabetic character. int isprint(int c)returns non-zero if c is a printable character. int ispunct(int c)returns non-zero if c is a printable character and is not a space or a digit or analphabetic character. int isspace(int c)returns non-zero if c is a space character, including space, CR, FF, HT, NL, and VT. int isupper(int c)returns non-zero if c is an upper-case alphabetic character. int isxdigit(int c)returns non-zero if c is a hexadecimal digit. int tolower(int c)returns the lower-case version of c if c is an upper-case character. Otherwise itreturns c.91