Convert characters in a string to upper case

Contract
Return type	string
No input parameters.

Water Contract
<method string.to_uppercase _return_type=string/>

See also: to_lowercase, to_uppercase, capitalize, titlecase

Returns a string with all the letters upper cased and the non-letters the same as in _subject If no characters needed conversion, then _subject is returned.

"abcdefgh!@#$".<to_uppercase />

"ABCDEFGH!@#$"