Factorial of a number is defined as:    n! = n(n-1)(n-2)(n-3)...(2)(1)   For example, 4! = 4*3*2*1     The n! can be written in terms of (n-1)! as:   n! = n* (n-1)!   (n-1)! = (n-1)*(n-2)!   and so forth.     Thus, in order to compute n!, we need (n-1)!, to have (n-1)!, we need (n-2)! and so forth. As you may immediately notice, the base case for factorial is 1 because 1! = 1. Write a program that uses a recursive function called factorial that takes an integer n as its argument and returns n! to the main.

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A:

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