I follow discussions on the Algorithms community on orkut. Came across one question which asked us to implement very big integers in C/C++. We can calculate 12! using integer data type, 20! using long long. Java provides a data type BigInteger which can handle it, Python can handle REALLY LARGE VALUES. In C/C++ we can implement this with the help of an integer array where each digit is represented as an element of the array. I have used a class for this purpose.
Here's my implementation of a large number in C++..