tolower---translate characters to lower case
#include <ctype.h> int tolower(int c); int _tolower(int c);
tolower is a macro which converts upper-case characters to lower
case, leaving all other characters unchanged. It is only defined when
c is an integer in the range
You can use a compiled subroutine instead of the macro definition by
undefining this macro using `
_tolower performs the same conversion as
tolower, but should
only be used when c is known to be an uppercase character (
tolower returns the lower-case equivalent of c when it is a
Z, and c otherwise.
_tolower returns the lower-case equivalent of c when it is a
Z. If c is not one of these
characters, the behaviour of
_tolower is undefined.
tolower is ANSI C.
_tolower is not recommended for portable
No supporting OS subroutines are required.
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