Problem 4: Let the user enter any integer N and use a while loop to calculate the factorial of this number. Note that, the factorial of any number N is the product of all the integers from N to 1: Factorial of N = N * N-1 * N-2 * N-3 .. 1 Also, use a counter to know the number of loops need in this process to find the factorial. Then, display the following sentences in the command window: ###### Factorial of N: N! = Number of loops need to find N! is ####