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.

  $\text{X}=\text{A }\cdot \text{ B}$    or     $\text{X}=\text{A * B}$

  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.

  $\text{X}=\text{A}+\text{B}$

  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