Short Quiz: while and sentinel loops

What is the purpose of a sentinel value in a loop?

• To limit the maximum iterations of the loop.

• To act as a special value that terminates the loop.

• To initialize the loop variable.

• To count the total number of iterations.

Which of the following best describes the structure of a while loop?

• The loop body executes at least once before checking the condition.

• The loop body executes repeatedly as long as the condition is true.

• The loop executes a fixed number of times regardless of the condition.

• The loop condition is checked only after all iterations are complete

In a sentinel-controlled loop, what happens if the sentinel value is never input?

• The loop will terminate immediately.

• The loop will run indefinitely.

• The loop will generate a compilation error.

• The loop will execute only once.

A microbiologist enters experimental data into a program. The program continues accepting input until the user enters -1. What is the purpose of -1 in this program?

• It represents the total number of data points.

• It is a placeholder for invalid data.

• It is the sentinel value to terminate the loop.

• It resets the data collection process.

If you are writing a program to measure bacterial growth over time, and you want to stop when the population reaches a critical size, which type of loop control would you use?

• Nested loop

• Infinite loop

• Counter-controlled loop

• Sentinel-controlled loop