4.2.3: basic while loop expression. write a while loop that prints usernum divided by 2 (integer division) until reaching 1. follow each number by a space. example output for usernum = 40: 20 10 5 2 1 note: these activities may test code with different test values. this activity will perform four tests, with usernum = 40, then with usernum = 2, then with usernum = 0, then with usernum = -1. see "how to use zybooks". also note: if the submitted code has an infinite loop, the system will stop running the code after a few seconds, and report "program end never reached." the system doesn't print the test case that caused the reported message.

def dividedByTwo(userNum):

   out = []

   num = userNum  

   while num > 1:

       num = num//2

       out.append(num)

   try:

       if out[-1]==1:

           print(str(userNum) + ': ' + str(out))

       else:

           print("Program end never reached.")

   except:

       print("Program end never reached.")

userNum = int(input())

dividedByTwo(userNum)

Explanation:

We created a function called dividedByTwo that receives the user input, inside the function is a while loop that just allows numbers greater than one to avoid an infinite loop, this while loop will finish when the division reaches one; finally, an if statement checks if 1 was reached, otherwise, an error message will prompt.

The output of the testing in the image down below

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