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Asked: 2026-05-25T13:28:31+00:00

If I use something like double to hold file sizes in bytes, this will

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If I use something like double to hold file sizes in bytes, this will naturally fail very soon, so which data type would I use? Nowadays a couple of TB are common, so I’d like the data type to be able to hold a number that big.

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  1. Editorial Team

    It will depends on you platform. On Unix System, you can probably use the off_t type. On Windows, you’ll probably want to use LARGE_INTEGER. Those are the types used on those system by the function returning the file size (stat on Unix, GetFileSize on Windows).

    If you want a portable type, uint64_t should be large enough.

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