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Page A3 Function return value: Note: None (a void function) If the preprocessor directive #define NDEBUG is placed before the directive #include<assert.h> all assert statements are ignored. The Header File ctype.h isalnum(ch) Parameter: Function return value: A char value ch An int value that is nonzero (TRUE) if ch is a letter or a digit character (AZ, az, 09) 0 (FALSE), otherwise isalpha(ch) Parameter: Function return value: A char value ch An int value that is nonzero (TRUE), if ch is a letter (AZ, az) 0 (FALSE), otherwise iscntrl(ch) Parameter: Function return value: A char value ch An int value that is nonzero (TRUE), if ch is a control character (in ASCII, a character with the value 031 or 127) 0 (FALSE), otherwise isdigit(ch) Parameter: Function return value: A char value ch An int value that is nonzero (TRUE), if ch is a digit character (09) 0 (FALSE), otherwise isgraph(ch) Parameter: Function return value: A char value ch An int value that is nonzero (TRUE), if ch is a nonblank printable character (in ASCII, ! through ~) 0 (FALSE), otherwise
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