This string predicate converts a string expression to an uppercase string. The predicate can only be used in a string expression.
see also: &/2 delete/3 expand_sq/1insert/3 is/2 replace/3 substring/3 string_list/2 to_lower/1 to_prolog/1 to_string/1 to_string/2 trim/1 triml/1 trimr/1 working with strings
| Examples | |
| X is_string to_upper('abcd'). | variable X is unified with the string "ABCD" |
| Exceptions | |
| The parameter is an empty variable | an instantiation_error exception is thrown |
| The parameter is a floating-point number | a type_error(callable, Arg) exception is thrown and Arg is replaced by the value of the parameter |