C programmers commit fresh crimes against readability

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The Twenty-Ninth International Obfuscated C Code Contest – or IOCCC for short – is back again with the results of the 2025 competition. This year, one of the entrants has a unique new trick up their sleeve: a valid use case.

When we reported on last year's event, it was had just been revived from a four-year hiatus, so we're happy to see it back so soon.

As we write, the judging concluded some three weeks ago, but although there is a recording on YouTube, it's very nearly three hours long. It took a while to edit it down to individual clips for each winner, which is why we are covering it now. For many of these programs, you really must see what they do to believe it, and although it's generally not our preferred format, video clips are superb for this.

There are no fewer than 23...

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