Concept explainers
Calculator Write a
Implementation of a program to create a calculator which performs addition, subtraction, and multiplication.
Program Plan:
Write a program which creates a calculator having two input text boxes in which the numbers are entered by the user.
The user can click on any of the three buttons of addition, subtraction, and multiplication.
Whichever button is clicked, it’s result will be calculated and displayed on the output textbox.
Program Description:
The program works for the creation of a calculator which adds, subtracts, or multiplies the two numbers entered by the user in two separate textboxes and displays the calculation in the output textbox.
There are two textboxes which take input from the user for the first number and the second number.
Three buttons, one for addition, second for subtraction, and the third for multiplication are created.
On clicking the respective buttons, the output textbox will display the calculation.
Explanation of Solution
Program:
Public Class Calculator
'Declare variable.
Dim var2 As Integer
'Declare variable.
Dim var1 As Integer
'Declare variable.
Dim result As Integer
'Create the event for the textbox.
Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged
'Assign value
var1 = TextBox1.Text
'Assign text to the textbox.
TextBox3.Text = var1
'Ending the function
End Sub
'Create text box event.
Private Sub TextBox2_TextChanged(sender As Object, e As EventArgs) Handles TextBox2.TextChanged
'Assign text to the textbox.
var2 = TextBox2.Text
End Sub
'Create a button click event
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
result = var1 + var2
'Assign text to the textbox.
TextBox3.Text = var1 & "+" & var2 & "=" & result
End Sub
'Create a button click evetn
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
result = var1 - var2
'Assign text to the textbox.
TextBox3.Text = var1 & "-" & var2 & "=" & result
End Sub
'Create a button click event
Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
result = var1 * var2
'Assign text to the textbox.
TextBox3.Text = var1 & "*" & var2 & "=" & result
End Sub
End Class
On pressing the addition button:
On pressing the subtraction button:
On pressing the multiplication button:
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