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_tolower() -- ctype Function (libc)

Convert characters to lower case
#include <ctype.h>
int _tolower(c) int c;

The function _tolower() converts the character c to lower case, and returns
the converted character.  Unlike the related function tolower(), _tolower()
is not guaranteed to work correctly if handed anything other than an upper-
case character, that is, a character for which isupper() returns true.

See Also

_toupper(),
libc,
tolower()

Notes

_tolower() is not  part of the ANSI standard; COHERENT  includes it only to
support old code.  You should use tolower() instead.