The ISUPPER function checks that an expression consists entirely of upper case characters.
NOTE: This function is only available in jBASE 4.1 and later.
expression can return a result of any type. The ISUPPER function will then return TRUE (1) if the expression consists of entirely upper case characters. The function will return FALSE (0) if any character in the expression is not upper case.
When the ISUPPER function is used in International Mode the properties of each character are determined according to the Unicode Standard.