isupper
Synopsis
#include <ctype.h>
int isupper(int c);
Status
Implemented
Conformance
IEEE Std 1003.1-2017
Description
The isupper() function shall test whether c is a character of class upper in the current locale.
The c argument is an int, the value of which the application shall ensure is a character representable as an
unsigned char or equal to the value of the macro EOF. If the argument has any other value, the behavior is
undefined.
Return value
The isupper() function shall return non-zero if c is an uppercase letter, otherwise shall return 0.
Errors
No errors are defined.
Tests
Tested
Known bugs
None