FracCalc is a calculator for performing simple arithmetic operations with fractions. This is the fraction calculator application from Programming in Objective-C 2.0, by Stephen Kochan. The calculator is based on Program 21.2 from Chapter 21 of that book, with enhanced features as described in the exercises at the end of the chapter. Most notably, a CVN key is added to convert fractions to decimals, operations can be chained, and they can be continued after the Equals key is pressed.
The source code for this application is available for download at the forum for the book: www.classroomM.com/objective-c.