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FreeBSD 11.0 - man page for isascii (freebsd section 3)

ISASCII(3)						   BSD Library Functions Manual 						ISASCII(3)

NAME
isascii -- test for ASCII character
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h> int isascii(int c);
DESCRIPTION
The isascii() function tests for an ASCII character, which is any character between 0 and octal 0177 inclusive.
SEE ALSO
ctype(3), iswascii(3), ascii(7)
BSD
October 6, 2002 BSD