Write a C$++$ program that takes a positive integer n as input and

prints the factorial of n as the output. The factorial of a positive integer n$,$ denoted as n$!,$

is the product of all positive integers less than or equal to n$.$ For example, $4!=24$ because

$4!=4\backslash$times $3\backslash$times $2\backslash$times $1.$

Specific Policy: Functions have not been covered in this class so far. Even if you are

familiar with them, it is not permitted to use functions to implement this program.

Sample Input:

$4$

Sample Output:

$24$

$2$