Python Coding Challange - Question with Answer (01170425)

 

Let me explain this code:

num = 1

while num < 6:

    print(num)

This code has a few issues that would cause it to run indefinitely (infinite loop). Let me break down why and how to fix it:

First, num = 1 initializes a variable num with the value 1

The while loop continues executing as long as num < 6 is True

Inside the loop, print(num) prints the current value of num

However, the code is missing an increment statement to update num, so num will always stay 1 and the condition num < 6 will always be True

Here's the corrected version:

python    num += 1  # Increment num by 1 in each iteration

num += 1  # Increment num by 1 in each iteration

This corrected version will:

1. Start with num = 1

2. Print: 1

3. Increment num to 2

4. Print: 2

5. Increment num to 3

6. Print: 3

7. Increment num to 4

8. Print: 4

9. Increment num to 5

10. Print: 5

11. Increment num to 6

12. Stop (because num < 6 is no longer True)

The output will be:

1

2

3

4

5

The key lesson here is that when using while loops, you need to make sure:

1. You have a proper condition that will eventually become False

2. You update the variables involved in the condition inside the loop

3. The loop has a clear way to terminate

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