Question

In: Computer Science

Create an ASP.Net Website using Visual Studio with Visual Basic.Net: Create a simple calculator that has...

Create an ASP.Net Website using Visual Studio with Visual Basic.Net:

Create a simple calculator that has 3 text boxes: 2 of them to enter numbers, the 3rd one displays the results

Create 4 buttons to add, subtract, multiply, and divide

Prevent the user from entering text in the number fields

Display a message indicating “cannot divide by” when the user click “/” and there is a zero the in the second box

Create two additional buttons:

- One to store data - The store data will store the results into array

- One to display data - The display data will display the contents of the array (use 10 for the array size)

Expert Solution

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new Asp.net web site in VB is created using Visual Studio with name "CalculatorUsingVB".This website contains a web page with name "WebForm.aspx".Below are the details of this web page.

WebForm.aspx :

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm.aspx.vb" Inherits="CalculatorUsingVB.WebForm" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<%-- title for web page --%>
<title>simple calculator using VB.net</title>
<%-- <script> is used for javascript --%>
<script>
//function to validate user inputs
function allowNumbers(e) {
var unicode=e.charCode? e.charCode : e.keyCode
       if (unicode!=8)
{
//allow backspace
       if (unicode<48||unicode>57) //if not a number
               {
       return false //disable key press
               }

       }
           else
           {
               return true;
           }
}

</script>
</head>
<body>
<form id="form1" runat="server">
Number 1:
<%-- textbox for first number --%>
<asp:TextBox ID="txtNumber1" runat="server" onkeypress="return allowNumbers(event);"></asp:TextBox>
<br />
<br />
Number 2 :
<asp:TextBox runat="server" ID="txtNumber2" onkeypress="return allowNumbers(event);"></asp:TextBox>
<br /> <br />
Result :      
<asp:TextBox runat="server" ID="txtResult"></asp:TextBox>
<br />
<br />
<br />
<%-- buttons --%>
<asp:Button runat="server" ID="btnPlus" Text="+" />
 <asp:Button runat="server" ID="btnMinus" Text="-"/>
 <asp:Button runat="server" ID="btnMultiply" Text="x" />
 <asp:Button runat="server" ID="btnDivide" Text="/" />
 <asp:Button runat="server" ID="btnStore" Text="Store" />
 <asp:Button runat="server" ID="btnDisplay" Text="Display" />
<br />
<br />
<%-- label ti display array data --%>
<label id="lblHeader" runat="server" />
</form>
</body>
</html>

********************************

WebForm.aspx.vb :

Public Class WebForm
Inherits System.Web.UI.Page
'declaring array to store results
Shared arr(10) As Double
'declaring variable
Shared i As Integer = 0
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

End Sub
'Plus button click
Protected Sub btnPlus_Click(sender As Object, e As EventArgs) Handles btnPlus.Click
'take numbers entered by user , parse it into integer and display result in the textbox
txtResult.Text = Integer.Parse(txtNumber1.Text) + Integer.Parse(txtNumber2.Text)

End Sub
'Minus button click
Protected Sub btnMinus_Click(sender As Object, e As EventArgs) Handles btnMinus.Click
'take numbers entered by user , parse it into integer and display result in the textbox
txtResult.Text = Integer.Parse(txtNumber1.Text) - Integer.Parse(txtNumber2.Text)
End Sub
'Multiply button click
Protected Sub btnMultiply_Click(sender As Object, e As EventArgs) Handles btnMultiply.Click
'take numbers entered by user , parse it into integer and display result in the textbox
txtResult.Text = Integer.Parse(txtNumber1.Text) * Integer.Parse(txtNumber2.Text)
End Sub
'divide button click
Protected Sub btnDivide_Click(sender As Object, e As EventArgs) Handles btnDivide.Click
'checking if second number is zero or not
If Integer.Parse(txtNumber2.Text) = 0 Then
'display message
txtResult.Text = "cannot divide by 0"
Else
'take numbers entered by user , parse it into integer and display result in the textbox
txtResult.Text = (Integer.Parse(txtNumber1.Text) / Integer.Parse(txtNumber2.Text)).ToString("0.00")
End If
End Sub
'store button click
Protected Sub btnStore_Click(sender As Object, e As EventArgs) Handles btnStore.Click
arr(i) = Double.Parse(txtResult.Text) 'store result in the array
i = i + 1 'increment value of i
End Sub
'disply button click
Protected Sub btnDisplay_Click(sender As Object, e As EventArgs) Handles btnDisplay.Click
Dim result As String = ""
'Using for loop
For index = 0 To arr.Length - 1
'checking if result is not zero then display
If arr(index) = 0 Then
'if value is zero do nothing
Else
result = result & arr(index) & " " 'display each array element in the label
End If
lblHeader.InnerText = result
Next
End Sub
End Class

======================================================

Output : Run application using F5 and will get the screen as shown below

Screen 1 :WebForm.aspx

Screen 2 :Screen showing addition and when display button clicked getting result from the array

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.

venereology answered 2 hours ago

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