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I need a calculator or program that I define a mathematical formula for it like Answer = Variable1+Variable2 and specify that Variable1 has max 5 digits and two decimal places...variable2 accepts let's say max 4 digits and also scientific notation..and then give it some values and it does the math....does excel do this? anything else?

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There's actually a term for what you're looking for. It's called CAS, which stands for Computer Algebra System. Since you don't specify an operating system or technical background, it makes it a little tough to recommend a package, but I personally would go with Sage which is the most popular and, arguably, the most robust.

If you would like to find more like it simply google "Computer Algebra System" with quotation marks or browse the google software directory.

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I might add that there's also a suite called Mathematica, but in my opinion it's grossly overpriced and the only thing it can do that sage can't is diophantine equations (which are technically unsolvable anyway). – Blomkvist May 19 '11 at 1:25
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