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Boolean Expressions

Table of Relational Operators

Operator	Meaning
A == B	is A equal to B ?
A < B	is A less than B ?
A <= B	is A less than or equal to B ?
A > B	is A Greater than B ?
A >= B	is A Greater than or equal to B ?
A != B	is A not equal to B ?

We need to look at the condition part of the if statement. Usually this will be a boolean expression. Recall that an expression is is a combination of literals, operators, variables, and parentheses used to calculate a value.

A boolean expression is an expression that evaluates to true or false.

Boolean expressions often make comparisons between numbers. A relational operator says what comparison you want to make.

Notice several details (that will be really annoying later on if you forget about them): the operator for "equal" is == (two equal signs in a row.) In your web browser it may be hard to see that there are two equal signs. The operator for "not equal" is != (exclaimation point equal sign.)