13. Boolean Expressions



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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.


Annotation 2020-03-08 215302


    



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   !=   (exclamation 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.






Question 13:
Fill in the blanks in the following chart:
Expression
Value
Expression
Value
25 == 25
25 != 25
25 <= 25
25 > 25
25 >= 25
25 = 25
-5 < 7
-305 <= 97