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Boolean Expressions

Relational Operators
OperatorMeaning
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):

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.

QUESTION 11:

Fill in the blanks in the following chart:

Expression ValueExpression Value
25 == 25 25 != 25
25 <= 25 25 > 25
25 >= 25 25 = 25
-5 < 7 -305 <= 97