Deranged Mutant wrote:

...

What do you mean? How big numbers are added (trivially easier than multiplication or division) or how it handles numbers that are too large for the variable's size?

and Ray Cromwell wrote : To add two bignums, P(x) and Q(x) simply sum coefficients of like terms like you would with any polynomial addition, with one simple modification. If a_k is the coefficient of the x^k term of P(x), and etc, etc. Just a quick clarification, people: In the UK, and, presumably Australia, "doing sums" refers to performing any kind of arithmetic, not just addition. And to Sherry Mayo: Don't give up on the code, just yet. Try running it and watching it with a debugger.