### 2). Factorial Using Function 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 Function 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 Function
long factorial(int n)
{
int counter;
long fact = 1;

//for Loop Block
for (int counter = 1; counter <= n; counter++)
{
fact = fact * counter;
}

return fact;
}

## Sample Output

Enter the Number :6
6 Factorial Value Is 720