ISASCII(3)

NAME
3.3 `isascii'--ASCII character predicate

SYNOPSIS
     #include <ctype.h>
     int isascii(int C);

DESCRIPTION
`isascii' is a macro which returns non-zero when C is an ASCII character, and 0 otherwise. It is defined for all integer values.
   You can use a compiled subroutine instead of the macro definition by undefining the macro using ``#undef isascii''.

RETURNS
`isascii' returns non-zero if the low order byte of C is in the range 0 to 127 (`0x00'-`0x7F').

PORTABILITY
`isascii' is ANSI C.
   No supporting OS subroutines are required.

SEE ALSO
isascii is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.