Issue 13.5 ("Text Messaging")

Spot the Error by Markus Winter

Errors with different integer types can be extremely subtle. What happens when you convert from one type to another? What about overflow errors? Markus challenges you to "Spot the Error" and explains what's really going on.

Simple Is Better by Mark Strickland

We're programmers -- we naturally like to make things complicated. But sometimes simple is a better approach, especially when it comes to user interfaces. Mark writes about how he used the simplest interface of all -- cell phone text messaging -- to create an electronic time clock system that employees in the field can use without a computer or even a smartphone.

Tracking Medications for Personal Health by JC Cruz

You might think a personal health journal is all about tracking your exercise, heart rate, and other details, but keeping your medications up-to-date is also critical. Jose explains how that works in his ongoing health project.

Plus articles on Xojo open source software, database design tools, making document-based applications, tips, and much more.