13./ Write a java program to input an integer N and compute its factorial. Print the number and the factorial.
The factorial is calculated by multiplying all the integers from the number upto 1. For example: factorial of
4 (4!) is : 4 x 3 x 2 x 1 = 24 or 4! = 1 x 2 x 3 x 4 =24.
