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Announcements

Announcements. Quiz 1 Posted on blackboard Quiz 1 Handed Back (and Gone Over) Next Monday “Just a Quiz” 5% of Final Grade Exam 1 is 10% of Final Grade. Selection (if-then-else). Programming Has 3 Types of Control: Sequential (normal) : Control of Execution Proceeds One after the Other

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Announcements

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  1. Announcements • Quiz 1 Posted on blackboard • Quiz 1 Handed Back (and Gone Over) Next Monday • “Just a Quiz” • 5% of Final Grade • Exam 1 is 10% of Final Grade

  2. Selection (if-then-else) • Programming Has 3 Types of Control: Sequential (normal): Control of Execution Proceeds One after the Other Selection (if-then-else): Control Proceeds Dependent on Conditions Iteration (looping): Control Repeated until Condition Met

  3. JAVA if Statement Syntax • Syntax if (condition)statement; • If Condition Is True, Statement Is Executed • If Condition Is False, Statement Is Not Executed • If Multiple Actions Are Required for Statement, a Compound Statement Must Be Used: if (condition) { statement; statement; }

  4. Conditional Operators • Relational Operators: < , > , >= , <= • Equality Operators: == , !=

  5. Comparing Strings • Cannot use Equality Operators • Use .equals() instead: String myString; … if (myString.equals(“Hello”) ) System.out.println(“Well, Hello to you too!!”);

  6. Selection Examples int age; char grade; String firstName; //Code to assign to age, grade, and firstName if (age < 30) System.out.println( “You are very very Young”); if (grade == ‘A’) System.out.println(“Congratulations!” ); if (grade != ‘F’) System.out.println(“You passed!” ); if (firstName.equals(“Jon”)) System.out.println(“Thanks, Jon!” );

  7. else Statement • Syntax: • if (condition) • { • statement(s);//condition true • } • else • { • statement(s);//condition false • }

  8. if-else Example • if (myGrade >= 60) • { • System.out.println(“You passed!” ); • } • else • { • System.out.println(“How about them Cubs?” ); • }

  9. Compound Statements • Compound Statement: One or More Statements within a Set of Curly Braces • Must Use Compound Statement if More than One Statement Is Supposed to be under Control of if or else Conditional • Include Curly Braces after if so if other Statements Are Added in Future, Curly Braces Are Already There

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