Decision Structure

7/28/2019 Decision Structure

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IfThen

Select Case


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Comparison Operator Meaning= Equal to

Not equal to

> Greater than

< Less than>= Greater than or equal to


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Conditional Expression Result10 20 True (10 is nor equal to 20)

Score < 20 True if Score is less than 20;otherwise, False

Score = Label1.Text True if the Text property of the

label1 object contains the samevalue as the Score variable;otherwise, False

TextBox1.Text = Bill True if the word Bill is in the firstext box; otherwise, False


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To evaluate a condition in the program andtake a course of action based on the result. IfconditionThenstatement

condition = conditional expression

statement = a valid VB program statement IfScore >= 20ThenLabelText1.Text = You Win!

this sort of comparison always result in True

or False, never result in maybe


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LogicalOperator MeaningAnd If both conditional

expression is True, then theresult is True

Or If either conditionalexpression is True, then theresult is True

Not If the conditional expressionis False, then the result isTrue. If the conditional

expression is True, then theresult is False.

Xor(exclusive Or)

If one and only one of theconditional expressions isTrue, then the result is True.If both are True or both are

False, then the result isFalse.

Logical Operator ResultVehicle = Bike And Price 10

n = x + 1

No

exit


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Chr(13) --> move to the beginning oflineChr(10) --> move to the next line


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Private Sub Command1_Click()Dim strName As String

strName = UCase(Text1.Text)

For i = 1 To 5

FontSize = 10 + iIf strName = keluar" Then Exit For

Print strName; " "; i

Next i

End Sub


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PSP 1

PSP2

PSP3

PSP 4

PSP 5


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Alternative toForNext loops

Execute a group ofstatement until acertain condition is

True Syntax :

Do whileconditionblock of statements tobe executed

Loop

Eg1:Dim InpName As StringDo While InpName DoneInpName = InputBox(Enter your name

or typeDone to quit)

IfInpName Done ThenTextBox1.Text = InpName

Loop Eg2:Dim InpName As StringDo

InpName = InputBox(Enter your nameor typeDone to quit)

IfInpName Done ThenTextBox1.Text = InpName

Loop While InpName Done


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It is important to design your test conditionso that each loop has a true exit point.

Example:Dim Number As Double

Do

Number = InputBox(Enter a number to square. Type -1to quit)

Number = Number * Number

TextBox1.Text = NumberLoop While Number >= 0


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BREAK


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Decision Structure

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