Transcript
Kelompok 8 Java Script : Control Statement II
Kelompok 8 Java Script : Control Statement II
Oleh:Kukuh I. 5108100122Brian M. 5108100156Yodiar Hellian 5108100165
Chapter 8 - JavaScript: Control Statements IIChapter 8 - JavaScript: Control Statements II
1. Introduction2. Essentials of Counter-Controlled Repetition3. For Repetition Statement4. Examples Using the for Statement5. Switch Multiple-Selection Statement6. Do…while Repetition Statement7. Break and continue Statements8. Labeled break and continue Statements9. Logical Operators
1. Introduction
• Continuation of Chapter 8– Theory and principles of structured programming
2. Essentials of Counter-Controlled Repetition
• Counter-controlled repetition– Name of a control– Initial value– Increment or decrement– Final value
While Counter.html
3. for Repetition Statement
• for repetition statement– Handles all the details of counter-controlled
repetition– for structure header
• The first line
3. for Repetition Statement
for ( var counter=1 ; counter<=7 ; ++counter )
Initial value of control variable Increment control variable
Control variable name Final value of control variable for which the condition is true
for keyword
Loop-continuation condition
3. for Repetition Statement
counter <= 7
document.writeln( "<p style=\"font-size: " + counter + "ex\">XHTML font size " + counter + "ex</p>" );
true
false
var counter = 1
++counter
Establish initial valueof control variable.
Determine if final value of control variable has been reached.
Body of loop (this may be many statements)
Increment the control variable.
Fig. 9.4 for repetition structure flowchart.
For Counter.html
4. Examples Using the for Statement
• Summation with for• Compound interest calculation with for loop
– Math object• Method pow• Method round
Sum.html
Interest.html
5. switch Multiple-Selection Statement
• Controlling expression• Case labels• Default case
SwitchTest.html
5. switch Multiple-Selection Statement
case a case a action(s)true
false
.
.
.
break
case b action(s) break
false
false
case z case z action(s) break
default action(s)
true
true
case b
6. do…while Repetition Statement
• Similar to the while statement• Tests the loop continuation condition after the
loop body executes• Loop body always executes at least once
6. do…while Repetition Structure
conditiontrue
action(s)
false
Fig. 9.10 do…while repetition statement flowchart.
DoWhile.html
7. break and continue Statements
• break
– Immediate exit from the structure– Used to escape early from a loop– Skip the remainder of a switch statement
• continue
– Skips the remaining statements in the body of the structure
– Proceeds with the next iteration of the loop
BreakTest.html
ContinueTest.html
8. Labeled break and continue Statements
• Labeled break statement– Break out of a nested set of structures– Immediate exit from that structure and enclosing
repetition structures– Execution resumes with first statement after enclosing
labeled statement• Labeled continue statement
– Skips the remaining statements in structure’s body and enclosing repetition structures
– Proceeds with next iteration of enclosing labeled repetition structure
– Loop-continuation test evaluates immediately after the continue statement executes
BreakLabelTest.html
ContinueLabelTest.html
9. Logical Operators
• More logical operators– Logical AND ( && )– Logical OR ( || )– Logical NOT ( ! )
9 Logical Operators
expression1 expression2 expression1 && expression2
false false false false true false true false false true true true
9. Logical Operatorsexpression1 expression2 expression1 ||
expression2 false false false false true true true false true true true true
expression !expression false true true false
LogicalOperators.html
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