A sentinel controls a given loop structure. In programming, a sentinel is a special value that is used to control the flow of a program. When the program encounters this value, it knows that it should stop looping and move on to the next part of the code. This is particularly useful in situations where you don't know in advance how many times you'll need to loop. For example, you might use a sentinel in a loop that reads input from the user until they enter a specific value, like "quit".

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A sentinel controls a given loop structure. In programming, a sentinel is a special value that is used to control the flow of a program. When the program encounters this value, it knows that it should stop looping and move on to the next part of the code. This is particularly useful in situations where you don't know in advance how many times you'll need to loop. For example, you might use a sentinel in a loop that reads input from the user until they enter a specific value, like "quit".

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A sentinel controls a given loop structure. In programming, a sentinel is a special value that is used to control the flow of a program. When the program encounters this value, it knows that it should stop looping and move on to the next part of the code. This is particularly useful in situations where you don't know in advance how many times you'll need to loop. For example, you might use a sentinel in a loop that reads input from the user until they enter a specific value, like "quit".

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A sentinel __________ a given loop structure.

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