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isgraph() -- ctype Function (libc) Check if a character is printable #include <ctype.h> int isgraph(int c); isgraph() tests whether c is a printable letter within the ASCII character set, but excluding the space character. The ANSI Standard defines a printable character as any character that occupies one printing position on an output device. c must be a value that is representable as an unsigned char or EOF. isgraph() returns nonzero if c is a printable character (except for space), and zero if it is not. See Also ASCII, libc ANSI Standard, 7.3.1.5 POSIX Standard, §8.1