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Re:Ask HK: I would like to re-learn C. Any suggestions for a... by talldayo on Thursday April 04, 2024 @04:18PM (#39935328)
A classic option - some sort of program that processes an RSS feed into legible information. Bonus points if you work out OPML parsing for multiple feeds.
Re:Ask HK: I would like to re-learn C. Any suggestions for a... by mytailorisrich on Thursday April 04, 2024 @04:25PM (#39935406)
Simple raytracer. Tangible, pleasing results.
Re:Ask HK: I would like to re-learn C. Any suggestions for a... by sgundo on Thursday April 04, 2024 @04:49PM (#39935642)
do you have any blog to suggest for an implementation?
Re:Ask HK: I would like to re-learn C. Any suggestions for a... by mytailorisrich on Thursday April 04, 2024 @05:45PM (#39936144)
If you're interested in the topic there is the aptly-named "Raytracing in one weekend" series of free books:

https://raytracing.github.io/