TOLOWER(3) MachTen Programmer’s Manual TOLOWER(3)

NAME
tolower - upper case to lower case letter conversion

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 argu-
ment is returned unchanged.

SEE ALSO
isascii(3), isalnum(3), isalpha(3), iscntrl(3), isdigit(3),
isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3),
isupper(3), isxdigit(3), toascii(3), toupper(3), stdio(3) ascii(7)

STANDARDS
The tolower() function conforms to ANSI C3.159-1989 (‘‘ANSI C’’).

4.4BSD June 4, 1993 1