### 1). Factorial Using Loop 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 For Loop In C++`
`    little drops @ thiyagaraaj.com`

`    Coded By:THIYAGARAAJ MP             */`

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

`using namespace std;`

`int main()`
`{`

`     // Variable Declaration`
`     int counter, n, fact = 1;`

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

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

`     cout<<n<<" Factorial Value Is "<<fact;`
`     // Wait For Output Screen`
`     getch();`
`     return 0;`
` }`

## Sample Output

Enter the Number :6
6 Factorial Value Is 720