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Final Study

In: Computers and Technology

Submitted By napm99
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Pt1420 Final Exam Guide
Boolean Expressions and Relational Operators –
Named after English mathematician George Boole. In 1800s Boole invented a system of mathematics in which the abstract concepts of true and false can be used in computations.
If-Then statement is formed with a relational operator, which determines whether a specific relationship exists between two values. (>) Greater than operator.
(==) Equal to operator.
(<) Less than operator. (>=) Greater than or equal to. (<=) Less than or equal to.
(!=) Not equal to.
The case structure is a multiple alternative decision structure. It allows you to test the value of a variable or an expression and then use that value to determine which statement or set of statements to execute.
The testExpression is usually a variable, but in many languages it can also be anything that gives a value (such as a math expression).
Short-Circuit Evaluation –
In many languages both the AND and OR operators perform short-circuit evaluation.
If the expression on the left side of the AND operator is false, the expression on the right side will not be checked.
Because the compound expression will be false if only one of the sub-expressions is false, it would waste CPU time to check the remaining expression.
So, when the AND operator finds that the expression on its left is false, it short-circuits and does not evaluate the expression on its right.
With the OR operator if the expression on the left side of the OR operator is true, the expression on the right side will not be checked.
Because it is only necessary for one of the expressions to be true, it would waste CPU time to check the remaining expression.

The NOT operator –
A unary operator that takes a Boolean expression as its operand and reverses its logical value. In other words, if the expression is true, the NOT operator returns…...

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