The issue is one of syntax.

Perl's syntax expects the body of the while conditional to be wrapped in parenthesis. This allows it to be read by others, including the interpreter. Every language has a syntax to make it understandable to multiple people. The English language, for example expects the first character of each sentence to be capitalized, a period (or some other form of punctuation...) at the end of each sentence, and spaces between words.

itdbealothardertoreadifiwrotelikethis!!!