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Cx51 User's Guide
#include <ctype.h> int _toupper ( int c); /* character to convert */
The _toupper routine is a macro version of toupper that may be used when c is known to be a lowercase character.
The _toupper macro returns an uppercase character.
_tolower, tolower, toupper
#include <ctype.h> void test__toupper (char k) { if (islower (k)) k = _toupper (k); }
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