function 2
DESCRIPTION
Visual basic 2010 functionsTRANSCRIPT
This Slides Will Cover1. The Right Function.
2. The Left Function.
3. The Trim Function.
4. The Ltrim & Rtrim Function.
5. The InStr function.
6. The Ucase and the Lcase Functions.
7. The Abs Function.
8. The Exp function..
9. The Fix Function.
10. The Int Function.
11. The Rnd( ) Function.
12. The Round Function.
Open new project and add 2 Labels, 1 Textbox and 1 Button
1. The Right Function
The format is:-
Microsoft.Visualbasic.Right ("Phrase", n)
Example
Microsoft.Visualbasic.Right (“Hello World", 5)=World
Label1Text = Right FunctionFont = 18 , BoldFormat \ Center in Form\Horizontally
Label2Text = …………Font = 16 , Bold
Button1Text = GoFont = 14 , Bold
Form1Text = Right Function Ex.Start Position = Center Screen
Button1 CodePrivate Sub Button1_Click
Label2.Text = Microsoft.VisualBasic.Right(TextBox1.Text, 5)
End Sub
2. The Left Function
The format is:-
Microsoft.Visualbasic.Left ("Phrase", n)
Modify Previous Program code ..
Private Sub Button1_Click
Label2.Text = Microsoft.VisualBasic.Left(TextBox1.Text, 5)
End Sub
Run Time
3. The Trim Function
The format is:-
Trim("Phrase")
Example:
Trim (" Visual Basic ") = Visual basic
Modify Previous Program code ..
Private Sub Button1_Click
Label2.Text = Trim(TextBox1.Text)
End Sub
Run Time
4. The Ltrim & Rtrim Function
The Ltrim FunctionThe format is:
Ltrim("Phrase")
Example:- Ltrim (" Visual Basic")= Visual basic
The Rtrim FunctionThe format is:Rtrim("Phrase")
ExampleRtrim ("Visual Basic ") = Visual Basic
5. The InStr function
The format is:
Instr (n, original phase, embedded phrase)
Where n is the position where the Instr function will
begin to look for the embedded phrase.
Private Sub Button1_Click Label2.Text = InStr(1, TextBox1.Text, "Egypt") End Sub
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Modify Button1 codeLabel2.Text = InStr(1, TextBox1.Text, "t")
Modify Button1 codeLabel2.Text = InStr(5, TextBox1.Text, "t")
And note the difference
6. The Ucase and the Lcase Functions
The Ucase function converts all the characters of a string
to capital letters.
The Lcase function converts all the characters of a string
to small letters.
The format is:-
Microsoft.VisualBasic.UCase(Phrase)
Microsoft.VisualBasic.LCase(Phrase)
7. The Abs Function
Return the absolute value of a given number.
The syntax is
Math. Abs (number)
The Math keyword here indicates that the Abs
function belong to the Math class.
Run Time
Private Sub Button1_Click
Label2.Text = Math.Abs(Val(TextBox1.Text))
End Sub
8. The Exp function
The Exp of a number x is the exponential value
of x………., i.e. e^x
Exp(1)=e=2.71828182
The syntax is:
Math.Exp (number)
9. The Fix Function
The Fix function truncate the decimal part of a
positive number and returns the largest integer
smaller than the number.
The syntax is:
Fix(number)
Private Sub Button1_Click Label2.Text = Fix(Val(TextBox1.Text)) End Sub
10. The Int Function
Example:-Int(2.4)=2, Int(6.9)=6 , Int(-5.7)=-6
(XI) The Log FunctionExample:-
Log(10)=2.302585
11. The Rnd( ) Function
The Rnd function returns a random value between 0 and 1.The traditional usage of this function is to covert its result to integer value …using the formula. Int(Rnd() * 10)
Modify Previous Program code .. Private Sub Button1_Click() Label2.Text = Int(Rnd() * 10) End Sub
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12. The Round Function
The Round function is the function that rounds
up a number to a certain number of decimal
places. The Format is Round (n, m) which means
to round a number n to m decimal places. For
Example:-
Math.Round (7.2567, 2) =7.26
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