94 Pages? I'll sum it up for you here: Rounding error happens. It's worse if you do add/subtract a very big number and a very small number. Rounding error inc

94 Pages? I'll sum it up for you here: Rounding error happens. It's worse if you do add/subtract a very big number and a very small number. Rounding error increases as you do more operations. Depending on your platform, you may need to accomodate NaN's and positive/negative infinity.