Two's Complement Subtraction
written by Crystal Barchet and Teresa Carrigan
- What is it?
- How it works
- How to use it
- Things to notice
- Things to try
- Extending the model
- NetLogo features
- Related models
- Credits and References
- For more information
- Run model in your browser
- Download the model
- Single webpage version
HOW TO USE IT
The setup button generates two random numbers stored in two's complement format.The slow-motion slider is an easy way to adjust the speed of the display so you can watch the digits change as the red arrow passes. Set it to zero if you want to just see the answer quickly. 0.5 is a good setting for the first few steps.
The step button does whatever step comes next, and then stops so you can take notes.
The go button finishes the entire problem, at a speed set by the slow-motion slider.
The show-again button starts the exact problem from the beginning. You may then click either the step button or the go button to see the same demonstration.
The quiz button generates a random problem and then asks you to determine the answer. Commas and spaces are ignored, so you may use them to prevent copy errors.
HomeApplets on this website were written by Teresa Carrigan in 2004, for use in computer science courses at Blackburn College, with the exception of the Fireworks applet. The applets made with NetLogo require Java 1.4.1 or higher to run. The applets made with NetBeans require Java 1.4.2 or higher to run. Applets might not run on Windows 95 or Mac OS 8 or 9. You may obtain the latest Java plugin from Sun's Java site.