NAME
tolower —
upper case to lower case letter
conversion
LIBRARY
library “libc”
SYNOPSIS
#include
<ctype.h>
int
tolower(int
c);
DESCRIPTION
Thetolower()
function converts an upper-case letter to the corresponding lower-case letter.
RETURN VALUES
If the argument is an upper-case letter, the
tolower() function returns the corresponding
lower-case letter if there is one; otherwise the argument is returned
unchanged.
SEE ALSO
ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), toupper(3), ascii(7)
STANDARDS
The tolower() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
CAVEATS
The argument to tolower() must be
EOF or representable as an unsigned
char; otherwise, the behavior is undefined. See the
CAVEATS section of
ctype(3) for more details.