Calculator
To create a calculator app using MIT App Inventor, follow these steps:
Step 1: Setup and Create Project
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Open MIT App Inventor:
- Go to the MIT App Inventor website.
- Log in with your Google account.
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Create a new project:
- Click on “Projects” and choose “Start new project”.
- Name your project, for example, “CalculatorApp”.
Step 2: Design the User Interface
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Go to the Designer screen:
- In the “Designer” tab, you will design the app’s user interface.
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Add Labels and TextBox:
- Label: Drag and drop a label onto “Screen1”. Rename it to “lblDisplay” and leave the Text field empty.
- TextBox: Drag and drop a TextBox. This will be for user input (no need to rename it).
Add Buttons:
- Button: Drag and drop 10 buttons. Rename each button and change their Text properties to “0”, “1”, “2”, “3”, “4”, “5”, “6”, “7”, “8”, “9” respectively.
- Add four more buttons and change their Text properties to “+”, “-“, “*”, “/”, and “=”.
OPEN block code.
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Create Variables:
- Create a variable named “input” and set it to an empty text.
- Create another variable named “operator” and set it to an empty text.
- Create a variable named “result” and set it to 0.
Set Blocks for Operator Buttons:
- For example, for the “+” button
Step 4: Test and Fine-Tune the App
