This calculator is text based, all calculations are done in "long hand". With additions its "Add the two digits; carry the one" etc. Subtraction is similiar. Multiplication is achieved by adding the first number to itself the specified number of times. Division is even worse, subtracting the denominator from the numerator until the numerator is less then the denominator, and counting the number of subtractions needed. Because of the requirements presented, the ChickenCalc only works with positive integers. ps. I am resubmitting this entry, I want it to replace my previous submission. Tha