HP C/iX Library Reference Manual (30026-90004)

220 Chapter5
HP C/iX Library Function Descriptions
islower
islower
Tests whether an argument is a lowercase letter.
Syntax
#include <ctype.h>
int islower (int c );
Parameters
c An argument to be evaluated. The argument must be representable as an
unsigned char or the macro EOF.
Return Values
≠0 The argument passed in c is a lowercase letter.
0 The argument passed in
c is not a lowercase letter.
Description
The islower function returns a nonzero value if the argument passed in c is a lowercase
letter (ASCII characters a through z); otherwise, the returned value is zero.
See Also
isalnum, isalpha, iscntrl, isdigit, isgraph, isprint, ispunct, isspace, isupper,
isxdigit, ANSI C 4.3.1.6, POSIX.1 8.1