Help with BigInt Library

[Bresser]

Hello so I want to start off this is not Homework.

But I am in a c++ class and we were going over recursion and a Factorial equation:

Quick sum if you don't know what a factorial is. Its like this Factorial of 6 is = 6 * 5 * 4 * 3 * 2 * 1 or 720

7 is = 7 * 6 * 5 * 4 * 3 * 2 * 1 or 5040.

So as you can imagine you hit the limits of C++ datatypes pretty fast. At 20 is the biggest you can do with int16_t and size 170 is the biggest you can do with double.

My teacher was telling us about the limitation of this and I thought I would use the bigInt library. But every time it only outputs one can anyone tell where I messed up?



// This program tests a recursive algorithm for the factorial

// function


#include
<iostream>

#include
<sstream>

#include
<stdint.h>

#include
<string>

#include
<iomanip>

#include
"BigIntegerLibrary.hh"

using
namespace std;


BigInteger Factorial (BigInteger number);
// Function prototype


int
main()

{



string theNumber;

BigInteger bigNumber;

bigNumber = stringToBigInteger(theNumber);


cout <<
"Enter whole number for factorial operation: ";

cin >> theNumber;

cout << endl << endl;

cout << theNumber <<
"! = " << Factorial(bigNumber) << endl;



system(
"pause");


return 0;

}


// This function receives an integer and calculates the

// factorial of that integer using a recursive algorithm

BigInteger Factorial (BigInteger number)

// Pre: number is assigned and number >= 0.

{


if ( number == 0) // base case


return 1 ;


else // general case

{


return number * Factorial(number - 1);

}



}


　

[spjackson]

This line


bigNumber = stringToBigInteger(theNumber);


should appear after you have read the value into theNumber, not before.