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NAMEislower —
lower-case character test
LIBRARYStandard C Library (libc, -lc)SYNOPSIS#include <ctype.h>
int
int
DESCRIPTIONTheislower () function tests for any lower-case letters.
The value of the argument must be representable as an unsigned
char or the value of EOF .
In the ASCII character set, this includes the following characters (with their numeric values shown in octal):
islower_l () function takes an explicit locale
argument, whereas the islower () function uses the
current global or per-thread locale.
RETURN VALUESTheislower () and islower_l ()
functions return zero if the character tests false and return non-zero if the
character tests true.
COMPATIBILITYThe 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered obsolete and may not be supported in future releases. Theiswlower () function should be used
instead.
SEE ALSOctype(3), iswlower(3), tolower(3), ascii(7)STANDARDSTheislower () function conforms to
ISO/IEC 9899:1990 (“ISO C90”).
The islower_l () function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
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