i dont made for negatives numbers, but i can think something for this in the future.
It error when subtracting from zero, or subtracting a larger number from a smaller, because it has no negative indexes.
1 + 1 = 1? This doesen't work very well
No, 0 - 9 = 7... the calculator is always right.
Es una buena calculadora. iMantener el buen trabajo!
Pretty decent. Deco could be better. =D +1