Sentinel:

Sentinel is the special value which is used to stop the sequence of series when there is no indication of explicit size.

It is also called as “flag value” or “dummy value” created in the algorithm to terminate the program.

The sentinel value must be a distinct value from the other data values, so that it is guaranteed to end the data.

For example: “null character” is used to end the null terminated string and a “negative integer” is used to indicate the end of sequence for non-negative integers.

Whenever the program reads the sentinel value it stops the execution of loop, because it knows that it reaches the end of sequence.

Example Program:

The following program code uses the sentinel value:

#Initialize the variables

total = 0

counter = 0

# Get the marks
...

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Chapter 5.4, Problem 5.23CP

Chapter 5.5, Problem 5.25CP

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Chapter 5 Solutions

Starting Out with Programming Logic and Design (4th Edition)

Ch. 5.1 - What is a repetition structure?Ch. 5.1 - What is a condition-controlled loop?Ch. 5.1 - What is a count-controlled loop?Ch. 5.2 - What is a loop iteration?Ch. 5.2 - What is the difference between a pretest loop and...Ch. 5.2 - Does the While loop test its condition before or...Ch. 5.2 - Does the Do-While loop test its condition before...Ch. 5.2 - What is an infinite loop?Ch. 5.2 - What is the difference between a Do-While loop and...Ch. 5.3 - What is a counter variable?

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Solution Summary: The author explains that sentinel is a special value used to stop the sequence of series when there is no indication of explicit size.

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