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

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Presentation transcript:

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

Dale Roberts 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)

Dale Roberts 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

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

Dale Roberts 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

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

Dale Roberts 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

Dale Roberts 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

Dale Roberts 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

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

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

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

Dale Roberts Acknowledgements Deitel, Java How to Program