Discussion
A sentinel character at the end of each buffer half serves to
Answer: C
Correct answer: combine the end of buffer test with the character comparison
Without a sentinel every character read needs two tests: is this the end of the buffer, and is it the character I am looking for. Placing a character that cannot occur in the source at the end of each half means the scanner tests only for that one value, and checks whether it has reached the end of the buffer only in the rare case where the sentinel actually appears.
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