4.3.4

Evaluating Expressions

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Evaluating Expressions

Logic gates can be combined to form logic circuits that process complex logical statements such as A AND (B OR C).

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Evaluating boolean expressions

  • To evaluate a boolean expression, you should substitute all of the values in for the variables and then use the definitions of the different boolean functions to simplify it one step at a time.
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Order of evaluation

  • You should evaluate any expression in brackets first, for example:
    • NOT(True OR False).
    • NOT(True).
    • False.
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Truth tables

  • Another method of evaluating an expression is using a truth table.
  • A truth table shows every possible combination of inputs and the resulting output.
  • The truth table shows the input and output state for each combination.
  • The table can then be used to look up the output.

Jump to other topics

1Components of a Computer

2Software & Software Development

3Exchanging Data

4Data Types, Data Structures & Algorithms

5Legal, Moral, Cultural & Ethical Issues

6Elements of Computational Thinking

6.1Thinking Abstractly

6.2Thinking Ahead

6.3Thinking Procedurally

6.4Thinking Logically

6.5Thinking Concurrently

7Problem Solving & Programming

8Algorithms

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