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 have been unwillingly retired from my book-writing and online-training careers, thanks to AI. Hopefully, I will create more material in the future. Even so, this site will remain active through 2028.

Recent Lessons

Ctype Functions: isgraph() and isprint(): May 30, 2026 Only a single character matters when comparing these two, similar ctype functions.
Ctype Functions: isalnum(), isalpha() and isdigit(): May 23, 2026 These ctype testing functions work on letters of the alphabet and numeric digits.
Ctype Functions: isupper() and islower(): May 16, 2026 These ctype testing functions work with letters 'A' through 'Z' and 'a' through 'z'
Ctype Functions: toupper() and tolower(): May 9, 2026 Character manipulation functions are handy — and easy to replicate.
The Ctype Functions: May 2, 2026 These handy functions manipulate and examine characters in a variety of fun and useful ways.

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

This Month's Exercise

That Series That Has No Name but Equals 5e: June 1, 2026 Time to put your programming skills to the test for another mathematical operation thingy.

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

Current Titles

Purchase

Purchase

Purchase

Purchase

Purchase

Purchase

Purchase

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.