Factorial of a number using C++

Factorial of a numebr $n$:

Factorial of a number $n$ is the product of the numbers from $1$ upto $n$. It is denoted by $n!$.

Example:  Factorial of  $3$ is $3! = 1 \times 2 \times 3 = 6 $
                 Factorial of $5$ is $5! = 1 \times 2 \times 3 \times 4 \times 5 = 120 $

Algorithm : 

1. Start the program
2. Read the number $n$
3. Initialize $i = 1$ and $factorial =1$
4. Multiply factorial with $i$ and store at factorial
5. Increment the $i$
6. Perform the step 4 and 5 until $i = n $
7. Stop the program

#include"iostream"

using namespace std;

int main()

{

    int num, factorial=1;

    cout<<" Enter a number to find the factorial :  ";

    cin>>num;

    for(int i=1;i<=num; i++)

    {

        factorial=factorial*i;

    }

cout<<"Factorial of the number is ="<<factorial << endl;
return 0;

}

INPUT :      Enter the number to find the factorial : 8

OUTPUT :  Factorial of the number is = 40320