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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T20:12:24+00:00 2026-05-16T20:12:24+00:00

My supposedly deterministic program produces one of a few slightly different outputs on different

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My supposedly deterministic program produces one of a few slightly different outputs on different runs. The input, compiler and computer are unchanging. I’m not sure which output is right because it always looks reasonable.

Besides a stray call to rand(), how could this be possible?

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  1. Editorial Team
    Editorial Team
    2026-05-16T20:12:25+00:00Added an answer on May 16, 2026 at 8:12 pm

    In several ways:

    • using multiple threads in a way that involves a data race,
    • using the current system time as input,
    • using uninitialized variables,
    • …

    We can surely make more guesses, but if you want to get meaningful help, maybe it would be good for you to publish the relevant parts of your code 🙂

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