toupper---translate characters to upper case
#include <ctype.h> int toupper(int c); int _toupper(int c);
toupper is a macro which converts lower-case characters to upper
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 `
_toupper performs the same conversion as
toupper, but should
only be used when c is known to be a lowercase character (
toupper returns the upper-case equivalent of c when it is a
z, and c otherwise.
_toupper returns the upper-case equivalent of c when it is a
z. If c is not one of these
characters, the behaviour of
_toupper is undefined.
toupper is ANSI C.
_toupper is not recommended for portable programs.
No supporting OS subroutines are required.
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