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