Introduction Chapter 4: Control structures. Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 2 Objectives What are control structures Relational.

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Presentation transcript:

Introduction Chapter 4: Control structures

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 2 Objectives What are control structures Relational Operators Logical operators Boolean expressions Conditional (Decision) statements Loop statements

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 3 What are Control Structures Without control structures, a computer would evaluate the instructions in a program step-by-step Control structures allow: Defining which instructions are evaluated Changing the order in which instructions are evaluated and Controlling the “flow” of the program Control structures include: Block statements (anything contained within curly brackets) Decision statements Loops

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 4 Relational Operators Relational operators produce boolean values. ==Equal to !=Not equal to <Less than <=Less than or equal to >Greater than >=Greater than or equal to

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 5 Use of relational Operators left_operand relational_operator right_operand counter < 5 counter <= maximum Relational operators can be combined with arithmetic operators: < 4  false because 8 is not < 4 myNumber % 2 == 1  false if myNumber is odd  true otherwise Relational operators are always performed last!!

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 6 Logical Operators Symbol Operator Name && AND || OR ! NOT || TF TTT FTF && TF TTF FFF TF ! FT

Introduction to OOPDr. S. GANNOUNI & Dr. A. TOUIRPage 7 Boolean Expressions Boolean expression is an expression that is evaluated to a boolean value. Atomic Boolean expression uses one and only one of the relational operators. myBalance <= yourBalance Complex Boolean expressions may be defined by linking other Boolean expressions using logical operators. (myBalance 20) (! (myBalance <= yourBalance) ) !! (yourAge <= 20) Boolean expressions may be assigned to boolean variables. boolean isHeOlder = (myAge < hisAge) ;