How to Build a Calculator in JavaScript
A working browser calculator in about a hundred lines: the markup, the state model, keyboard handling, and the operator precedence problem that trips…
Build Your Own Calculator
Tutorials for writing calculator apps in JavaScript, Python, C++ and more.
How to Build a Calculator in Python
Start with a command-line calculator, then replace the dangerous eval() call with a small expression parser you control. Includes the shunting-yard a…