TOLOWER(3)

NAME
3.13 `tolower'--translate characters to lowercase

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

DESCRIPTION
`tolower' is a macro which converts uppercase characters to lowercase, leaving all other characters unchanged. It is only defined when C is an integer in the range `EOF' to `255'.
   You can use a compiled subroutine instead of the macro definition by undefining this macro using ``#undef tolower''.
   `_tolower' performs the same conversion as `tolower', but should only be used when C is known to be an uppercase character (`A'-`Z').

RETURNS
`tolower' returns the lowercase equivalent of C when it is a character between `A' and `Z', and C otherwise.
   `_tolower' returns the lowercase equivalent of C when it is a character between `A' and `Z'. If C is not one of these characters, the behaviour of `_tolower' is undefined.

PORTABILITY
`tolower' is ANSI C. `_tolower' is not recommended for portable programs.
   No supporting OS subroutines are required.

SEE ALSO
tolower is part of the library. The full documentation for is maintained as a Texinfo manual. If info and are properly installed at your site, the command

    info

will give you access to the complete manual.