How to calculate factorial of a number (C++)

Factorial

factorial() calculates the factorial of the given value and it takes 1 parameter:

number takes the value whose factorial is to be determined.

Code

#include "stdafx.h"

#include "iostream"

#include "conio.h"

#include "iomanip"

using namespace std;

double factorial(int number)

{

double factorial=1;

 for(int i=number;i>0;i--)

  factorial=factorial*i;

return factorial;

}

int main()

{

       cout << factorial ( 0.0 ) << endl ;

       cout << factorial ( 1.0 ) << endl ;

       cout << factorial ( 2.0 ) << endl ;

       cout << factorial ( 3.0 ) << endl ;

       cout << factorial ( 4.0 ) << endl ;

       cout << factorial ( 5.0 ) << endl ;

       cout << factorial ( 6.0 ) << endl ;

       cout << factorial ( 7.0 ) << endl ;

       cout << factorial ( 8.0 ) << endl ;

       cout << factorial ( 9.0 ) << endl ;

       _getche();

       return 0;

}

Output

1

1

2

6

24

120

720

5040

40320

362880