Question

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.

Answer 1

Answer:

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

Answer 2

Answer:

import java.io.*;

import java.util.Scanner;

class divide {

public static void main (String[] args) {

    Scanner num=new Scanner(System.in);//scanner object.

    int userNum=num.nextInt();

    while(userNum>1)//while loop.

    {

        userNum/=2;//dividing the userNum.

        System.out.print(userNum+" ");//printing the userNum.

    }

}

}

Input:-

40

Output:-

20 10 5 2 1

Input:-

2

Output:-

1

Input:-

0

Output:-

No Output

Input:-

-1

Output:-

No Output.

Explanation:

In the program While loop is used.In the while loop it divides the userNum by 2 in each iteration and prints the value of userNum.The inputs and corresponding outputs are written in the answer.