Talking Calculator

Now available at appinventor.misterv.ca Basics

Project Description:

This project creates a very simple calculator that will do the four basic arithmetic operations, + - x /.

The result of the calculation will be displayed on the screen and converted to speech. 

Simple error checking will be introduced.

This program will use:

• • numbers to text

  • text to speech

  • building a sentence

  • mathematical calculations

  • textboxes for input

  • labels for output

  • events to change labels and perform calculations

  • basic error checking

  • Notifier to issue error messages

Set up the User Interface (UI)

Get the Basic Code Working

Basic Code for the Add Button:

Modifications -- Check for errors

Modify the code you have to check for 

Errors to check for:

• • the calculator requires two numbers to perform calculations, issue message if 2 number are not entered.

  • This code will need to be further modified to check for the divide by 0 error

Now get all four buttons working

Create the code for the - x and / buttons

Extra error checking will be needed for the / button -- Why? What is the extra check?