TOLOWER(3)

NAME
tolower - upper case to lower case letter conversion

LIBRARY
libc

SYNOPSIS
#include <ctype.h>
int
tolower(int c);

DESCRIPTION
The tolower() 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 ansiC.

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.