Question 32

A user is asked to enter a password repeatedly until either a correct password is entered or five incorrect attempts have been made.

Using a while loop, a program can continuously prompt the user for input until a specific condition is met, such as entering the correct password or reaching a maximum number of attempts. This demonstrates the iterative nature of while loops effectively.

A) The user inputs an integer, and the program prints out whether the number is even or odd and whether the number is positive, negative, or zero.

This option describes a situation that could be handled with a conditional statement rather than a while loop. A single input can be evaluated immediately without the need for repeated iteration, making this approach less suitable for a while loop.

B) A user is asked to enter a password repeatedly until either a correct password is entered or five incorrect attempts have been made.

This option correctly illustrates the use of a while loop, as it requires continuous prompting for user input until one of the specified conditions is satisfied. This ongoing check for either the correct password or the limit on attempts exemplifies the purpose of a while loop.

C) When the user inputs a number, the program outputs 'True' when the number is a multiple of 10.

Similar to option A, this scenario involves a single input that can be evaluated immediately. There is no need for a repeated evaluation over multiple iterations, which makes the use of a while loop unnecessary in this case.

D) After inputting two numbers, the program prints out the larger of the two.

This option describes a straightforward comparison between two inputs, which can be executed with a simple conditional statement. There is no iterative process involved, and thus a while loop would not be applicable for this task.

Conclusion

The correct answer, option B, effectively demonstrates the capability of a while loop to handle repeated user input based on specific conditions. In contrast, the other options either describe tasks better suited for conditional statements or do not require iteration at all, making them ineffective examples for the use of a while loop.