Bigint modification

I am new to C++. I want to learn working with really large values with Bigint. I downloaded the code fromhttp://sourceforge.net/projects/cpp-bigint/.
I can compile and run it. But I dont have enough knowledge to delete all the demo code from there.
It runs in 3 seconds flashing some text on the screen and then quits.
Can someone help me to:
1) Get rid of all the demo code
2) Help me add some simple code like:
"#include "BigInt.h"
BigInteger a = 65536;
cout << (a * a * a * a * a * a * a * a);"
I tried to add it, but compilation fails.
3) Keep DOS window open instead of quitting. I tried adding system ("pause"); but it would not comile.
I wouldn't mind spooling it to a text file too.

I am reading C++ in 21 days to learn this, but I don't have 21 days.
The code is at http://sourceforge.net/projects/cpp-bigint/. Your help is much appreciated!
1 and 2) Apparently BigInt isn't a beginner friendly class and it has no instructions. Maybe NTL would be a bit easier to use?
http://shoup.net/ntl/

3) Well.
http://www.cplusplus.com/forum/articles/7312/

-Albatross
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