Functions
Variables
Variables are used to store data. A variable has a name to which we refer and the data type, the type of data the variable holds. You need to declare variables before using them. Variables are declared with the Dim keyword and Dim stands for Dimension.
Variables Sample
The following code creates two variables, adds them and stores the sum in a third variable.
Constants
When we have certain values that we frequently use while programming, we should use Constants. A value declared as constant is of fixed value that cannot be changed once set. Constants should be declared as Public if we want it to be accessed by all parts of the application. We use the Const keyword to declare a constant. The following line of code declares a constant:
Public Const Pi as Double=3.14159265
SubProcedures
Procedures are a series of statements that are executed when called. Procedures makes us handle the code in a simple and organized fashion. Sub procedures are procedures which do not return a value. Each time when the Sub procedure is called, the statements within it are executed until the matching End Sub is encountered. The Page_Load event, which is the starting point of the program itself is a sub procedure. When the application starts execution, the control is transferred to Page_Load procedure automatically which is called by default.
SubProcedures Sample
Functions
Function is a Procedure which returns a value. Functions are used to evaluate data, make calculations, or to transform data. Declaring a Function is similar to declaring a Sub procedure but functions are declared with the Function keyword. The following is an example on Functions. This simple application is an online loan repayment calculator that asks the user to enter the amount he wants to borrow, the duration of the loan and based on that information calculates his monthly repayments. To start, drag four labels, two textboxes and a button from the toolbox on to the Web Forms page. Open the code designer and paste the following code. Look at Live Code demo towards the botom of this page for user interface design.
Live Code Demo
Functions
XYZ Loan Repayment Calculator
Enter the amount you wish to borrow
Enter your loan repayment period in years
Your monthly repayment is: 313888
Not Satisfied ? Would you like to try another option?
Variables
Variables are used to store data. A variable has a name to which we refer and the data type, the type of data the variable holds. You need to declare variables before using them. Variables are declared with the Dim keyword and Dim stands for Dimension.
Variables Sample
The following code creates two variables, adds them and stores the sum in a third variable.
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Private Sub Page_Load(ByVal sender As System.Object, ByVal e As_ System.EventArgs) Handles MyBase.Load Dim x As Integer = 10 Dim y As Integer = 20 Dim z As Integer = x + y Response.Write("Sum is" & " " & z) End Sub |
Constants
When we have certain values that we frequently use while programming, we should use Constants. A value declared as constant is of fixed value that cannot be changed once set. Constants should be declared as Public if we want it to be accessed by all parts of the application. We use the Const keyword to declare a constant. The following line of code declares a constant:
Public Const Pi as Double=3.14159265
SubProcedures
Procedures are a series of statements that are executed when called. Procedures makes us handle the code in a simple and organized fashion. Sub procedures are procedures which do not return a value. Each time when the Sub procedure is called, the statements within it are executed until the matching End Sub is encountered. The Page_Load event, which is the starting point of the program itself is a sub procedure. When the application starts execution, the control is transferred to Page_Load procedure automatically which is called by default.
SubProcedures Sample
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Private Sub Page_Load(ByVal sender As System.Object, ByVal e As_ System.EventArgs) Handles MyBase.Load Display() 'control looks for a sub procedure named Display() and executes it End Sub Sub Display() Response.Write("In Sub Procedure") End Sub |
Functions
Function is a Procedure which returns a value. Functions are used to evaluate data, make calculations, or to transform data. Declaring a Function is similar to declaring a Sub procedure but functions are declared with the Function keyword. The following is an example on Functions. This simple application is an online loan repayment calculator that asks the user to enter the amount he wants to borrow, the duration of the loan and based on that information calculates his monthly repayments. To start, drag four labels, two textboxes and a button from the toolbox on to the Web Forms page. Open the code designer and paste the following code. Look at Live Code demo towards the botom of this page for user interface design.
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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As_ System.EventArgs) Handles Button1.Click Calc() 'when the user submits his data, control passes to Calc function End Sub Public Function Calc() As Long Dim amt, temp, temp1, totinterest, mi, mitemp, tot As Double 'declaring the required variables temp = CInt(TextBox1.Text) * 13 'multiplying the amount the user wants to borrow with 13.Assuming the 'interest rate to be 13% totinterest = temp / 100 'calculating the interest amount for the amount entered mitemp = CInt(TextBox2.Text) * 12 'multipling the years entered with 12 to get the number of months mi = totinterest / mitemp 'calculating monthly interest temp1 = CInt(TextBox2.Text) * 12 'multipling the years entered with 12 to get the number of months amt = CInt(TextBox1.Text) / temp1 'dividing the amount borrowed with number of months it is borrowed for tot = amt + mi 'calculating the total by adding the amount + monthly interest Label1.Text = "Your monthly repayment is:" & " " & Int(tot) disp() End Function Public Sub Disp() Label4.Text = "Not Satisfied? Would you like to try another option?" End Sub |
Live Code Demo
Functions
XYZ Loan Repayment Calculator
Enter the amount you wish to borrow
Enter your loan repayment period in years
Your monthly repayment is: 313888
Not Satisfied ? Would you like to try another option?
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