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Home/ Questions/Q 5987543
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T22:49:49+00:00 2026-05-22T22:49:49+00:00

Which cast is fastest in C#? Assume that I have a 64 bit floating

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Which cast is fastest in C#? Assume that I have a 64 bit floating point. Would it be faster to convert it to a 32 bit integer, or a 64 bit integer (assuming that data loss is not relevant to me)?

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  1. Editorial Team
    Editorial Team
    2026-05-22T22:49:50+00:00Added an answer on May 22, 2026 at 10:49 pm

    There are several ways to find this out, each with their own advantages.

    • experimental evidence: do a large number of each cast in a massive loop and time them, trying to keep all other possible factors consistent.
    • look at the machine code for the two casts and do an proper analysis on which is faster.
    • ask the developers.

    Me, I would opt for the first choice as a first run since it’s the easiest to do and doesn’t involve any third parties. Only if it were unclear would I move to the second method.

    And I wouldn’t trust a third-party anyway unless they showed some evidence, and they might not get back to you before your homework deadline.

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