The documentation for 'if' is here http://docs.racket-lang.org/reference/if.html?q=if
Here's a slightly modified example from the doc using 'if': (if (positive? -5) (error "shouldn't get here") (display "hi")) You might want to consider the 'when', documented here http://docs.racket-lang.org/reference/when_unless.html?q=when And here's an example from the doc using 'when': (when (positive? -5) (display "hi")) Cheers, Kieron.
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