Program to Find Factorial of a Number using Iteration

1. #include<iostream>

2. using namespace std;

3. class fact

4. {

5. public:

6.     /*

7.      * Function to find the factorial

8.      */

9.     int factorial(int n)

10.     {

11.         int i;

12.         int pro = 1;

13.         for(i = n; i > 1; i--)

14.         {

15.             pro = pro * i;

16.         }

17.         if(n == 0)

18.         {

19.             pro = 1;

20.         }

21.         return pro;

22.     }

23. };

24. /*

25.  * Main function

26.  */

27. int main()

28. {

29.     fact f;

30.     int n;

31.     cout<<"Enter the number whose factorial is to be calculated\t";

32.     cin>>n;

33.     cout<<"\nFactorial of "<<n<<" is = "<<f.factorial(n);

34.     return 0;

35. }

Output

1. Enter the number whose factorial is to be calculated    5
 
   Factorial of 5 is = 120
2. Enter the number whose factorial is to be calculated    0
 
   Factorial of 0 is = 1