The Unofficial C For Dummies Website

This page supports the C programming books written by Dan Gookin, as well as the C language training courses offered online at LinkedIn Learning. All coders are welcome.

I am retired, though I will continue to update my blog at least through 2028.

Recent Lessons

How Real Numbers are Stored in Binary: October 24, 2026 Representing a decimal value, tiny or huge, using only ones and zeros is an artform.
Peeking at Data Stored in a Union: October 17, 2026 What you see in a union is based on how the data is interpreted.
Tagging a Union: October 10, 2026 Unions are useful and safe, providing that you know how to tag the data.
The Scary Part of the Union: October 3, 2026 Security is an issue for a union as its data is shared between different types.
Back When Unions Were Useful: September 26, 2026 Over 40 years ago, using a union was common when coding an MS-DOS program.

Lessons are posted each Saturday; see the blog for all the Lessons

This Month's Exercise

The Clock Angle Problem: October 1, 2026 How many degrees are there between the big hand and the little hand?

Exercises are posted on the first of the month; see the blog for all the Exercises

Current Titles

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For support on my older C titles: Beginning C Programming, C All-In-One reference and C For Dummies.

Online Training

Online training is provided through Linkedin Learning, a subscription service. Click here to see my available courses. New courses are frequently available and updated.

"For Dummies" is a trademark or registered trademark of John Wiley.
This site is the online companion to the various
C language titles written by Dan Gookin.