html-calculator Tier: 1-Beginner Calculators are not only one of the most useful tools available, but they are also a great way to understand UI and event processing in an application. In this problem ...

JavaScript-Calculator This is a basic JavaScript Program for beginners A basic calculator JavaScript program performs arithmetic operations such as addition, subtraction, multiplication, and division.

This is a complete tutorial, discussing how to build a simple calculator app for Android. Check it out, and implement some of the recommended improvements.

We rather fear that live syntax validation as you hand-code HTML is one answer to this, but on its own isn't sufficient. But we really wish it were – and we would be very happy to be wrong.