Building a calculator program is one of the best ways to train one’s mind when it comes to creating an algorithm and forming logic. Though a calculator sounds easy to create, it might not that as simple to create as you think even the most basic one that compose only of the MDAS (Multiplication, Division, Addition and Subtraction) operations. Obviously, these operations can be processed by human brain easily but teaching a program to think that way is another thing.

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Visual Basic: Shapes - Areas + Volumes This is the source code for this example program: here This is an Area Calculator for 2D shapes + a Surface Area + Volume Calculator for 3D shapes, that uses Classes + Inheritance.

A VB.Net Calculator Program Before VB.Net arrived in 2002, the highly popular Visual Basic 6 provided programmers with the ability to create what were known as control arrays.In real terms, a control array was actually a collection of controls that could be programmed as an array thanks to some fairly complex behind-the-scenes code provided by Microsoft.
This is the snippet A Scientific Calculator in Visual Basic on FreeVBCode. The FreeVBCode site provides free Visual Basic code, examples, snippets, and articles on a variety of other topics as well.

In this tutorial, we are going to create a basic calculator application in Microsoft Visual C# that performs the four basic mathematical operations.

Step 1: Create a New Project

First things first, create a new C# project by going to File > New and choose Windows Form Application template in order for you to create an application with a Windows Forms user interface. Change the project name into “Basic Calculator” to easily find the project later on though you can name it whatever you want. Click OK!

After creating the project, you will now have the basic Windows form in your screen. When you double click the form, it will open the program window and it should already have the basic code such as the using directive, namespace declaration.

Step 2: Declaring Variables

Though variable is not required to perform the functions of a calculator, we are still going to declare for the sake of good practice. Declare the following variables after the public partial class Form1 : Form

Variables Explained:

operation: Save the operation to be used in the form of “+”, “-“, “*” and “/”
firstOperand: Save the first number
secondOperand: Save the second numbe
answer: Save the calculated result
clear: Determine what kind of clear function to be used. “S” for single digit and “A” for all digits.

Step 3: Build the Calculator Interface

You can now add the controls necessary to create the calculator interface using the Toolbox located in the left side of the screen. In this case, we are going to use Button and TextBox.

Crack myob v18 serial number. Add the following:

A TextBox where you can enter numbers and show result
Buttons that will serve as keypad containing the following:
- Numbers from 0-9
- Decimal point
- Clear function
- Four operations to be used (+. -, *, /)
- Equal button using the equals sign.

Note: When creating a program, it is suggested to use a consistent naming convention to easily distinguish controls from one another at a glance.

To rename a control, go to the property window in the right side and use a naming convention like below (or create your own):

Button Number 0: btnNum0
Button Number 1: btnNum1
Button Number 2: btnNum2
Button Number 3: btnNum3
Button Number 4: btnNum4
Button Number 5: btnNum5
Button Number 6: btnNum6
Button Number 7: btnNum7
Button Number 8: btnNum8
Button Number 9: btnNum9
Button Decimal Point: btnDecimal
Button Equal: btnEqual
Button Clear Function: btnClear
Button Addition: btnAdd
Button Subtraction: btnSubtract
Button Multiplication: btnMultiply
Button Division: btnDivide
Result Textbox: txtInput

Step 4: Program the Number Buttons (0-9) and Decimal Point

Like a typical calculator application, we would like to display the number in the textbox based from whatever button is clicked by the user. To display a value in a textbox control, we will use the text property of the textbox. The syntax for using the said property is something like this:

There is, however, a problem if you are going to use the syntax above. Every time the the button is clicked, it will always be a single digit and the number that will appear in the textbox is the last clicked button. To fix this problem, use the syntax below instead:

Double click the Button 0 to create a btnNum0_click event handler and add the above code between the curly braces. After adding the code, it will look like this:

The above code simply gets the initial value of the textbox first, add another digit based from whatever number button is clicked and finally display the result in the textbox. Since the value of the textbox is a String, it will only concatenate the numbers.

Tip: You can also simplify the code by using a “+=” operator. The code will look like this: Visual

txtInput.Text += “0”.

Repeat the above step for all the numerical input event handlers (number buttons) as well as the decimal button event handler. Change the “0” value from the code and replace it depending which button handler you are in. Your code will now look like this:

Step 5: Program the Clear Function

The clear function will perform two different forms. The first form is to remove a single digit from a group of numbers. This second form is to remove all digits in the textbox which is normally performed after getting the result. The variable clear will determine which among the forms will be performed by the button.

Code Explained:

Line 3: Since the default value of clear variable is “S”, it will only remove a single digit form the right every time the button is clicked.
Line 7: This will be activated only when the value of the variable is changed into “A” which will be coded in the equal button (after getting the answer).

Step 6: Program the Mathematical Operations

For the buttons designated to the mathematical operations, a series of actions will be needed to perform to make sure that the calculator will work as expected. This is where the importance of algorithm (step-by step procedure) will be seen. The said actions are as follows:

Save the value of the textbox into a variable.
Clear the textbox to give way to the next operand.
Save the operation to be used.

Double click the Button + to create a btnAdd_click event handler and add the code like below:

Visual Basic Code Of Simple Calculator Tutorial

Code Explained:

Visual Basic Code Of Simple Calculator Free

Line 2: Save the value of txtInput textbox into firstO