Working With Variables

We can assign values to those variables,after declaring various variables using the Dim statements. The general format of an assignment is variable=Expression and the variable can be a declared variable or a control property value. The expression could be a mathematical expression, a number, a string, a Boolean value ( false or true) and etc. The following are some examples:

firstNumber=100
secondNumber=firstNumber-99
userName="John Lyan"
userpass.Text = password
Label1.Visible = True
Command1.Visible = false
Label4.Caption = textbox1.Text
ThirdNumber = Val(usernum1.Text)
total = firstNumber + secondNumber+ThirdNumber

Operators in Visual Basic

We need to use various mathematical operators in order to compute inputs from users and to generate results.In Visual Basic, except for + and -, the symbols for the operators are different from normal mathematical operators as shown in following table:

Operator	Mathematical function	Example
^	Exponential	2^4=16
*	Multiplication	4*3=12
/	Division	12/4=3
Mod	Modulus(return the remainder from an integer division)	15 Mod 4=3
\	Integer Division(discards the decimal places)	19\4=4
+ or &	String concatenation	"Visual"&"Basic"="Visual Basic"

The following example describe the use of operator in VB

Dim firstName As String

Dim secondName As String

Dim yourName As String

Private Sub Command1_Click()

firstName = Text1.Text

secondName = Text2.Text

yourName = secondName + " " + firstName

Label1.Caption = yourName

End Sub

In this example, three variables are declared as string and for variables secondName and firstName will receive their data from the user�s input into textbox1 and textbox2, and the variable yourName will be assigned the data by combining the first two variables. Finally, yourName is displayed on the Label1.

Dim number1, number2, number3 as Integer

Dim total, average as variant

Private sub Form_Click

number1=val(Text1.Text)
number2=val(Text2.Text)
number3= val(Text3.Text)

Total=number1+number2+number3

Average=Total/5

Label1.Caption=Total

Label2.Caption=Average

End Sub

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