Write a C program that allows a user to enter an integer n$.$ The program will then compute the factorial of n$.$ Note that the factorial of $0$ is $1,$ and the factorial of $1$ is $1.$

What is the factorial of n$?$ n$*($n$-1)*($n $2)*($n $3)........*1$

For example, $6$ factorial denoted as $6!=6$X$5$X$4$X$3$X$2$X$1=720$

Submit your code and output for the number $6.$