Visual Basic . Net #2

Hello Guys, If you didn't see Visual Basic Series Introduction click here

Ok, Let's start Open Visual Studio 2012
In this tutorial, You will learn

How to make a simple calculator 

First, Simple calculator idea is very easy user will enter 2 number in 2 Textbox and She/He will choose one operation between multiply, divide, subtract, add and the result will appear in label
so we will need 4 Buttons, 2 Textboxes,  4 Label 1 For Result and 2 to Hint near Textboxes and one to write description

1. Make a new Project File > New > Project, or From Start Page left sidebar press New Project.

Start Page

2. Choose Visual Basic and WindowsForm Application as in Picture and Change the name

3. Put 4 buttons, 2 textboxes, 4 labels and change the text property as following

• Button1 →→→→→→→→ Add
• Button2 →→→→→→→→ Subtract
• Button3 →→→→→→→→ Multiply
• Button4 →→→→→→→→ Divide
• Label1 →→→→→→→→   Result
• Label2 →→→→→→→→   Num1
• Label3 →→→→→→→→   Num2
• Label4 →→→→→→→→  "Any Thin you want in my case I will write Welcome to Simple Calculator that made by ThinkFakar"

Program Design

4. Ok Let's go to Coding window press Double click on Add Button (Button1)

The Main rule in Visual Basic is Control.Property = Value 

Write this code

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim num1 As Integer

        Dim num2 As Integer

        num1 = TextBox1.Text

        num2 = TextBox2.Text

        Dim result As Integer

        result = num1 + num2

        Label1.Text = result

    End Sub

End Class

Ok Let's analyse the code

Dim num1 As Integer

Dim is a word to Define a variable

num1  is the name of the variable

"As" after it, you can find the type of the variable

Integer is the type of the variable

num1 = TextBox1.Text

This line means that PC will take the value in Textbox1.text ( The Number that User will enter ) and put it in variable num1

result = num1 + num2

In this Line, the PC will take num1 and num2 and it will add them then put it in result variable

5. Coding of Subtract Button (Button2)

The code

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

        Dim result As Integer

        result = CInt(TextBox1.Text) - CInt(TextBox2.Text)

        Label1.Text = "Result : " & result

End Sub

Ok Let's analyse the code

result = Cint(TextBox1.Text) - Cint(TextBox2.Text)

Ok, now we have a new Function Cint (Conversation Integer). It is very easy function that will convert any types to integer read about it more here so I save time instead making 3 variable I made 1 only Read More here

Label1.Text = "Result : " & result

This line will appear word "Result: " without quotation and the result

6. Coding of Multiply Button

The Code

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

        Label1.Text = "Result : " & (CInt(TextBox1.Text) * CInt(TextBox2.Text))

End Sub

As we see here we didn't use any variable

7. Coding of Divide Button

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

        Label1.Text = "Result : " & (CInt(TextBox1.Text) / CInt(TextBox2.Text))

End Sub

same Code as Multiply Button

Conclusion

We must learn from this tutorial that the code can be written in different ways and it do the same things every time 

Has any question?  Comment Below ↓↓↓↓

Wait for me next tutorial how to make simple Game ( Catch Me )