Discussion
Input buffering with two halves is used in a scanner to
Answer: B
Correct answer: reduce the cost of reading characters one at a time from the file
Reading is done a block at a time into one half of the buffer while the scanner works through the other, so a system call is made once per block rather than once per character. The two-half arrangement also allows a lexeme to straddle the boundary, since the beginning of it survives in the half that has not yet been refilled.
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