I am new to C++. I want to learn working with really large values with Bigint. I downloaded the code
from C++ BigInt class | Download C++ BigInt class software for free at SourceForge.net.
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 C++ BigInt class | Download C++ BigInt class software for free at SourceForge.net. Your help is much appreciated!