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Dale Roberts Program Control using Java - Boolean Expressions Dale Roberts, Lecturer Computer Science, IUPUI Department of.

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Presentation on theme: "Dale Roberts Program Control using Java - Boolean Expressions Dale Roberts, Lecturer Computer Science, IUPUI Department of."— Presentation transcript:

1 Dale Roberts Program Control using Java - Boolean Expressions Dale Roberts, Lecturer Computer Science, IUPUI E-mail: droberts@cs.iupui.edu Department of Computer and Information Science, School of Science, IUPUI

2 Dale Roberts 2 5.8 Logical Operators Logical operators Allows for forming more complex conditions Combines simple conditions Java logical operators && (conditional AND) || (conditional OR) & (boolean logical AND) | (boolean logical inclusive OR) ^ (boolean logical exclusive OR) ! (logical NOT)

3 Dale Roberts 3 5.8 Logical Operators (Cont.) Conditional AND ( && ) Operator Consider the following if statement if ( gender == FEMALE && age >= 65 ) ++seniorFemales; ++seniorFemales; Combined condition is true if and only if both simple conditions are true Combined condition is false if either or both of the simple conditions are false

4 Dale Roberts 4 Fig. 5.14 | && (conditional AND) operator truth table.

5 Dale Roberts 5 5.8 Logical Operators (Cont.) Conditional OR ( || ) Operator Consider the following if statement if ( ( semesterAverage >= 90 ) || ( finalExam >= 90 ) System.out.println( “Student grade is A” ); System.out.println( “Student grade is A” ); Combined condition is true if either or both of the simple condition are true Combined condition is false if both of the simple conditions are false

6 Dale Roberts 6 Fig. 5.15 | || (conditional OR) operator truth table.

7 Dale Roberts 7 5.8 Logical Operators (Cont.) Short-Circuit Evaluation of Complex Conditions Parts of an expression containing && or || operators are evaluated only until it is known whether the condition is true or false E.g., ( gender == FEMALE ) && ( age >= 65 ) Stops immediately if gender is not equal to FEMALE

8 Dale Roberts 8 5.8 Logical Operators (Cont.) Boolean Logical AND ( & ) Operator Works identically to && Except & always evaluate both operands Boolean Logical OR ( | ) Operator Works identidally to || Except | always evaluate both operands

9 Dale Roberts 9 5.8 Logical Operators (Cont.) Boolean Logical Exclusive OR ( ^ ) One of its operands is true and the other is false Evaluates to true Both operands are true or both are false Evaluates to false Logical Negation ( ! ) Operator Unary operator

10 Dale Roberts 10 Fig. 5.16 | ^ (boolean logical exclusive OR) operator truth table.

11 Dale Roberts 11 Fig. 5.17 | ! (logical negation, or logical NOT) operator truth table.

12 Dale Roberts 12 Fig. 5.19 | Precedence/associativity of the operators discussed so far.

13 Dale Roberts Acknowledgements Deitel, Java How to Program

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