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 Function: isxdigit(): June 27, 2026 No, the isxdigit function doesn't identify former digit characters. The "x" here refers to hexadecimal.
Ctype Function: ispunct(): June 20, 2026 The ispunct function identifies ASCII characters classified as punctuation, which covers more ground than you may first think.
Ctype Functions: isascii() and iscntrl(): June 13, 2026 These functions seem unnecessary, but do play a role in evaluating a char value.
Ctype Functions: isblank() and isspace(): June 6, 2026 Don't get spaced out if you're drawing a blank! One is merely a subset of the other.
Ctype Functions: isgraph() and isprint(): May 30, 2026 Only a single character matters when comparing these two, similar ctype functions.

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

This Month's Exercise

It's All Greek!: July 1, 2026 Write a custom ctype-like function that works with the Greek alphabet.

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.