AND Operator: An AND operator accepts two inputs and produces a single output. If both the inputs are CLOSE, then the output is ON. Otherwise, the output is OFF. In Boolean expression, the AND operation is expressed using the “.” dot operator or “” asterisk operator. X = A ⋅ B or X = A B where A and B are the inputs and X is the output. Truth table for AND operator: INPUTA INPUT B OUTPUT X OPEN OPEN OFF OPEN CLOSE OFF CLOSE OPEN OFF CLOSE CLOSE ON OR Operator: An OR operator accepts two inputs and produces a single output. If both the inputs are OPEN, then the output is OFF. Otherwise, the output is ON. In Boolean expression, the OR operation is expressed using the “+” plus sign. X = A + B where A and B are the inputs and X is the output. Truth table for OR operator: INPUTA INPUT B OUTPUT X OPEN OPEN OFF OPEN CLOSE ON CLOSE OPEN ON CLOSE CLOSE ON

Question

Question D.4: FIFO Page Replacement Consider the following page reference string: e, c, b, e, a, g, d, c, e, g, d, a Considering 4 frames, fill in the following table and then answer how many page faults would occur with the FIFO page replacement algorithm. RS: reference string; FO: frame 0, F1: frame 1, etc. Hint: all frames are initially empty, so your first unique pages will all cost one fault each. Time 1234567891011 12 RS e cb e agd ce g d a FO F1 F2 F3 Page fault? b) Total # page faults: c) Briefly (1-2 sentences) explain Belady's Anomaly that can occur in FIFO Page Replacement.

Answer 1

Question

Chapter 1, Problem 4P

Program Plan Intro

AND Operator:

An AND operator accepts two inputs and produces a single output.

If both the inputs are CLOSE, then the output is ON. Otherwise, the output is OFF.

In Boolean expression, the AND operation is expressed using the “.” dot operator or “” asterisk operator.

X=A ⋅ B or X=A B

where A and B are the inputs and X is the output.

Truth table for AND operator:

INPUTA
INPUT

B

OUTPUT

X
OPEN OPEN OFF
OPEN CLOSE OFF
CLOSE OPEN OFF
CLOSE CLOSE ON

OR Operator:

An OR operator accepts two inputs and produces a single output.

If both the inputs are OPEN, then the output is OFF. Otherwise, the output is ON.

In Boolean expression, the OR operation is expressed using the “+” plus sign.
X=A+B

where A and B are the inputs and X is the output.

Truth table for OR operator:

INPUTA
INPUT

B

OUTPUT

X
OPEN OPEN OFF
OPEN CLOSE ON
CLOSE OPEN ON
CLOSE CLOSE ON

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