How to Make a Calculator in Visual Basic 6

Introduction

• The tutorial demonstrates creating a calculator in Visual Basic 6.
• Begin by showing a demonstration of the application and then build it from scratch.

Prerequisites

• Visual Basic 6 installed on your system.

Steps to Create the Calculator

1. Starting a New Project

• Open Microsoft Visual Basic and start a new project.
• Choose 'Standard EXE' and click on open.

2. Setting Up the Form

• Change the caption of the form to "Calculator".

3. Adding Controls

Text Box Control

• Add a text box control to act as the display.
• Set 'Text' property to blank and 'Name' property to 'display'.

Command Buttons for Digits

• Create a control array for digits 0-9:
  • Place a command button, name it 'digits', and set the caption to '0'.
  • Copy and paste to create more buttons.
  • Confirm to create a control array when prompted.
  • Change captions for each button from 0-9.

Additional Command Buttons

• Add buttons for operations:
  • Clear (C), Percentage (%), Divide (/), Multiply (x), Subtract (-), Add (+), Dot (.), Equal (=).
• Set name and caption properties for each button.

4. Adjusting Appearance

• Font and Size:
  • Use 'Stencil' font, size 36.
  • Set height and width to 1000 for uniformity.
• Align controls neatly on the form.

5. Adding Functional Code

Declare Variables

• Open the code window and declare variables:
  • Option Explicit
  • Dim var1, var2 As Double
  • Dim oprn As String

Input Handling

• Set text box to display inputs using control array for digits.
• Code for each digit button to append its caption to the display.

Operation Buttons

• Clear Button:
  • Clears the text box.
• Percentage, Divide, Multiply, Subtract, Add:
  • Capture initial value, clear display, and set operation.
• Dot Button:
  • Appends a dot to current display.

Equal Button

• Execute operation based on oprn variable using Select Case.
• Operations include addition, subtraction, division, multiplication, and percentage calculation.

6. Testing

• Run the application to test functionality.
• Perform calculations to ensure accuracy.

7. Final Touches

• Change button and form colors for better aesthetics.
• Add shape controls with style settings for visual enhancement.
• Right justify text box content.

Conclusion

• Follow the tutorial step-by-step to create a functional calculator.
• The video provides a complete guide to building the application.

Call to Action

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