Calculator App in MIT App Inventor with Downloadable AIA, Code & Design

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DESIGN VIEW

Build a fully functional Calculator App using MIT App Inventor that performs basic arithmetic operations like addition, subtraction, multiplication, and division. This beginner-friendly mobile app development project is perfect for students, teachers, and Android app development beginners.

The app features a clean design layout, responsive number buttons, operator controls, and a display area to show user inputs and final results.

Project Overview: MIT App Inventor Calculator App

This Calculator App is developed using MIT App Inventor, a visual block-based programming platform for Android app development.

The application allows users to:

  • Perform Addition (+)

  • Perform Subtraction (−)

  • Perform Multiplication (×)

  • Perform Division (÷)

  • Clear inputs and reset calculations

It is an ideal project for learning mobile app design, UI components, and logical block programming.

 Design View (User Interface)

The Calculator App includes:

  • Display Label/TextBox – Shows numbers and results

  • Number Buttons (0–9) – For entering digits

  • Operator Buttons (+, −, ×, ÷) – For selecting arithmetic operations

  • Equals Button (=) – To calculate the result

  • Clear Button (C) – To reset all values

The layout is arranged in a grid format for easy user interaction and a clean mobile-friendly appearance.

 Elements Used in MIT App Inventor

🔹 User Interface Components

  • Button components (0–9, +, −, ×, ÷, =, C)

  • Label or TextBox (for display screen)

  • Vertical & Horizontal Arrangements (for layout design)

🔹 Blocks (Programming Logic)

  • Variables (to store first number and selected operator)

  • Button Click Events

  • Mathematical operation blocks

  • Conditional logic (if-else statements)

Working Principle

  1. When a number button is pressed, its value is added to the display.

  2. When an operator button is clicked:

    • The first number is stored.

    • The selected operation is saved.

  3. When the equals (=) button is pressed:

    • The second number is taken.

    • The app performs the stored operation.

    • The result is displayed.

  4. The Clear (C) button resets all stored values and clears the screen.



ELEMENTS USED

Each number button adds its value to the display when pressed. Operator buttons store the selected operation and the first number. When the equals button is clicked, the app calculates the result based on the chosen operation and displays it. A clear button is included to reset all values and start a new calculation.
















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