Question

n the case of the sentinel-controlled while loop, the first item is read before the while loop is entered. True False

Answer 1

Answer:

True

Explanation:

Sentinel-controlled repetition is often called indefinite repetition because the number of repetitions is not known before the loop begins executing. A sentinel value must be chosen that cannot be confused with an acceptable input value.

The pseudocode for a sentinel-controlled while loop look like this:

• Prompt the user to enter the first input
• Input the first value (possibly the sentinel)
• While the user has not yet entered the sentinel
•         Execute some statement block
•         Prompt the user to enter the next grade
•         Input the next grade (possibly the sentinel)