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Boolean Expressions

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 is a boolean expression. Recall that an expression is is a combination of literals, operators, variable names, and parentheses used to calculate a value.

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

Boolean expressions often compare numbers. A relational operator says how the numbers are compared.

Here are some annoying 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).

It is easy to forget these two details, and easy to overlook these details in a program. You might spend hours debugging a program because a   =   was used where a   ==   belongs.