Off topic a little:
One of the things that has always driven me crazy is how the standard windows calculator will give different results than the scientific calculator. This is is because the simple calculator ignores the order of operations. If you enter the following calculation in both calculators, you get different results:
3+2*4= results in 11 for scientific calculator.
3+2*4= results in 20 for standard calculator.
Drives me crazy that such a thing should be allowed to occur!