I am new to c++ , and was going through question factorisation of september challenge which required concept of big num arithmetic .May someone please provide me some online material for understanding big num arithmetic in c++.Problem link:

link text

- http://ajmarin.alwaysdata.net/codes/problems/764/ (This is a class developed in c++)
- http://www.codechef.com/wiki/tutorial-small-factorials (This is a question in Codechef that requires multiplication of Big Integers.

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May you please provide me with some more resources about the class developed in c++ as in this question we have to scan numbers > 10^20

Basically, the concept is that you proceed in the same way that you used to do when you multiplied, added of subtracted two numbers in elementary school. Read the 2nd tutorial carefully.