3). Factorial Using Recursion Example Program In C++

Simple C++ Example Programs

Definition

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

6! = 6 x 5 x 4 x 3 x 2 x 1 = 720

The value of 0! is 1, according to the convention for an empty product.

Example Program

/*  Example Program For Factorial Value Using Recursion In C++
    little drops @ thiyagaraaj.com

    Coded By:THIYAGARAAJ MP             */

#include<iostream>
#include<conio.h>

using namespace std;

//Function
long factorial(int);

int main()
{

     // Variable Declaration
     int counter, n;

     // Get Input Value
     cout<<"Enter the Number :";
     cin>>n;

     // Factorial Function Call
     cout<<n<<" Factorial Value Is "<<factorial(n);

     // Wait For Output Screen
     getch();
     return 0;
 }

// Factorial recursion Function
long factorial(int n)
{
  if (n == 0)
    return 1;
  else
    return(n * factorial(n-1));
}

Sample Output

Enter the Number :6
6 Factorial Value Is 720