_toupper - transliterate lower-case characters to upper-case
#include <ctype.h> int _toupper(int c);
The _toupper() macro is equivalent to toupper(3C) except that the argument c must be a lower-case letter.
On successful completion, _toupper() returns the upper-case letter corresponding to the argument passed.
No errors are defined.
See attributes(5) for descriptions of the following attributes:
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