 Public Class Form1
    Dim firstnum As Decimal
    Dim secundnum As Decimal
    Dim oparation As Integer
    Dim selected As Boolean = False


    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "1"
        Else
            TextBox1.Text = "1"
        End If
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "2"
        Else
            TextBox1.Text = "2"
        End If
    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "3"
        Else
            TextBox1.Text = "3"
        End If
    End Sub

    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "4"
        Else
            TextBox1.Text = "4"
        End If
    End Sub

    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "5"
        Else
            TextBox1.Text = "5"
        End If
    End Sub

    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "6"
        Else
            TextBox1.Text = "6"
        End If
    End Sub

    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "7"
        Else
            TextBox1.Text = "7"
        End If
    End Sub

    Private Sub Button10_Click(sender As Object, e As EventArgs) Handles Button10.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "8"
        Else
            TextBox1.Text = "8"
        End If
    End Sub

    Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "9"
        Else
            TextBox1.Text = "9"
        End If
    End Sub

    Private Sub Button13_Click(sender As Object, e As EventArgs) Handles Button13.Click
        If Not (TextBox1.Text.Contains(".")) Then
            TextBox1.Text += "."
        End If
    End Sub

    Private Sub Button11_Click(sender As Object, e As EventArgs) Handles Button11.Click
        If TextBox1.Text <> "0" Then
            TextBox1.Text += "0"

        End If
    End Sub

    Private Sub Button15_Click(sender As Object, e As EventArgs) Handles Button15.Click
        TextBox1.Text = "0"
    End Sub

    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        firstnum = TextBox1.Text
        TextBox1.Text = "0"
        selected = True
        oparation = 1 ' +
    End Sub

    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click
        firstnum = TextBox1.Text
        TextBox1.Text = "0"
        selected = True
        oparation = 2 ' -
    End Sub

    Private Sub Button14_Click(sender As Object, e As EventArgs) Handles Button14.Click
        firstnum = TextBox1.Text
        TextBox1.Text = "0"
        selected = True
        oparation = 3 ' *
    End Sub

    Private Sub Button16_Click(sender As Object, e As EventArgs) Handles Button16.Click
        firstnum = TextBox1.Text
        TextBox1.Text = "0"
        selected = True
        oparation = 4 ' /
    End Sub

    Private Sub Button17_Click(sender As Object, e As EventArgs) Handles Button17.Click
        If selected = True Then
            secundnum = TextBox1.Text
            If oparation = 1 Then
                TextBox1.Text = firstnum + secundnum

            ElseIf oparation = 2 Then
                TextBox1.Text = firstnum - secundnum
            ElseIf oparation = 3 Then
                TextBox1.Text = firstnum * secundnum
            Else
                If secundnum = "0" Then
                    TextBox1.Text = "مشكلة"
                Else
                    TextBox1.Text = firstnum / secundnum
                End If

            End If
        End If
        selected = False
    End Sub
End Class

created 3 years ago by omar

Visual basic (VB.net) Online Compiler

Write, Run & Share VB.net code online using OneCompiler's VB.net online compiler for free. It's one of the robust, feature-rich online compilers for VB.net language, running on the latest version 16. Getting started with the OneCompiler's VB.net compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as VB.net. OneCompiler also has reference programs, where you can look for the sample code to get started with.

Read input from STDIN in VB.net

OneCompiler's VB.net online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample VB.net program which takes name as input and prints hello message with your name.

Public Module Program
	Public Sub Main(args() As string)
	 Dim name as String = Console.ReadLine()    ' Reading input from STDIN
   Console.WriteLine("Hello " & name)           ' Writing output to STDOUT
	End Sub
End Module

About VB.net

Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.

Key Features

Beginner's friendly language.
Simple and object oriented programming language.
User friendly language and easy to develop GUI based applications.

Syntax help

Variables

Variable is a name given to the storage area in order to identify them in our programs.

Simple syntax of Variable declaration is as follows

Dim variableName [ As [ New ] dataType ] [ = initializer ]

Variable initialization

variableName = value

Conditional Statements

1. If

If condition-expression Then 
    'code
End If

2. If-else

If(conditional-expression)Then
   'code if the conditional-expression is true 
Else
  'code if the conditional-expression is false 
End If

3. If-else-if ladder

If(conditional-expression)Then
   'code if the above conditional-expression is true 
Else If(conditional-expression) Then
        'code if the above conditional-expression is true 
    Else
        'code if the above conditional-expression is false 
End If

4. Nested-If

If(conditional-expression)Then
   'code if the above conditional-expression is true
   If(conditional-expression)Then
         'code if the above conditional-expression is true 
   End If
End If

5. Select Case

Select [ Case ] expression
   [ Case expressionlist
      'code ]
   [ Case Else
      'code ]
End Select

Loops

1. For..Next

For counter [ As datatype ] = begin To end [ Step step ]
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ counter ]

2. For..Each

For Each element [ As datatype ] In group
   'code
   [ Continue For ]
   'code
   [ Exit For ]
   'code
Next [ element ]

3. While

While conditional-expression
   'Code 
   [ Continue While ]
   'Code
   [ Exit While ]
   'Code
End While

4. Do-while

Do { While | Until } conditional-expression
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop

Do
   'Code
   [ Continue Do ]
   'Code
   [ Exit Do ]
   'Code
Loop { While | Until } conditional-expression

Procedures

Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Procedures are of two types.

1. Functions

Functions return a value when they are called.

[accessModifiers] Function functionName [(parameterList)] As returnType
   'code
End Function

2. Sub-Procedures

Sub-procedures are similar to functions but they don't return any value.

Sub ProcedureName (parameterList)
'Code
End Sub