Write a program that reads in an integer greater than 1 in from the user. the program then computes and print out the factorial of the number read in. the factorial of a number is the product of all the natural numbers less than or equal to the number itself. that is the factorial of n is 1*2*3* (n-2)*(n1)*n. your program should stop if the user enters a negative number. design you will probably want to make a class called integer which has a single instance variable of class int. this class would also have an accessor method for the value and a method factorial, which will compute the factorial. this separates the input and output from the computation. sample output enter a number: 5 the factorial of 5 is 120. enter a number: 8 the factorial of 8 is 40320. enter a number: 12 the factorial of 12 is 479001600. enter a number: -1 you and bye.