The Stocalculator is a four-function calculator based on the C Standard Library random number generator. By the rules of the contest, the Stocalculator is considered a fully-functioning calculator by passing the official test cases in sequential order. The Stocalculator is only guaranteed to pass these cases in the month of May, 2007. If you wish to reproduce the above test cases at another time, you must adjust your system clock accordingly. This is a feature, not a bug.