isgraph - test for a visible character int isgraph(int c); [CX]
The functionality described on this reference page is aligned
with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of IEEE Std 1003.1-2001 defers to the ISO C standard. The
isgraph() function shall test whether c is a character of class
graph in the program's current locale; see the Base Definitions
volume of IEEE Std 1003.1-2001, Chapter 7, Locale. The c
argument is an int, the value of which the application shall
ensure is a character representable as an unsigned char or equal
to the value of the macro EOF. If the argument has any other
value, the behavior is undefined. The isgraph() function shall
return non-zero if c is a character with a visible
representation; otherwise, it shall return 0. No errors are
defined. To ensure applications portability, especially across
natural languages, only this function and those listed in the
SEE ALSO section should be used for ch