Test a character to see if it's an uppercase letter
#include <wctype.h> int iswupper( wint_t wc );
- The wide character you want to test. This argument must be a wide-character code that corresponds to a valid character in the current locale, or must be WEOF; otherwise, the function's behavior is undefined.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The iswupper() function tests if the argument wc is an uppercase wide character of the class upper. In the C locale, this class includes the characters from A through Z.
A nonzero value if the character is a member of the class upper, or 0 otherwise.
The result is valid only for wchar_t arguments and WEOF.