0

Hello,

So my program (to calculate n factorial) works well, except for one thing, it won’t output correctly after 12. My other 2 projects working with factorials ( calculating the constant e and e^x) worked because I used data type long. I tried doing it with my program but it did not work, I am not sure I was doing something wrong.

This post has a solution which I ran and it has the same issue:

http://www.daniweb.com/forums/showthread.php?t=344&highlight=factorial

Can someone please help? My code is below:

```
#include "Factorial.h" // include definition of class Factorial
// declaration and input phase
// validate the input
void Factorial::validate(int enteredInteger)
{
}
// constructor
Factorial::Factorial(int enteredInteger)
{
setVariables(enteredInteger);
}
// set functions to initialize the variables
void Factorial::setVariables(int enteredInteger)
{
nFactorial = 1;
value = enteredInteger;
factor = enteredInteger;
}
void Factorial::setN(int enteredInteger)
{
n = enteredInteger;
}
int Factorial::getFactorial()
{
return nFactorial;
}
int Factorial::getInteger()
{
return n;
}
void Factorial::compute()
{
int integer;
cout << "Enter a nonnegative integer to compute its factorial: ";
cin >> integer;
validate(integer);
setN(integer);
do
{
factor = n - value;
nFactorial *= factor;
value += 1;
} while (value < n);
displayMessage();
}
void Factorial::displayMessage()
{
cout << "The n factorial of " << getInteger() << "!" << " is " << getFactorial() << "." << endl;
}
```