64-bit quantaties

This is a discussion on 64-bit quantaties within the C Programming forums, part of the General Programming Boards category; What's "best" type to use to guarantee a 64-bit quantity? I know it's implementation and platform dependent, but is their ...

  1. #1
    pdc
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    64-bit quantaties

    What's "best" type to use to guarantee a 64-bit quantity? I know it's implementation and platform dependent, but is their any sort of de facto standard? I've seen int64_t, __int64, int64...

    Also, on a somewhat unrelated note, do 64-bit architectures generally supply primitive types longer than 64 bits?

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    pdc
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    Answering my own question, it seems that int64_t is the correct choice, as of C99. Second question still stands, though.

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    Just Lurking Dave_Sinkula's Avatar
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    Quote Originally Posted by pdc
    Also, on a somewhat unrelated note, do 64-bit architectures generally supply primitive types longer than 64 bits?
    I suppose it all depends on the architecture, but FWIW...
    Registers

    The IA-64 architecture includes a very generous complement of registers: 128 each of 82-bit floating point and 64-bit integer registers.
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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    Registered User joed's Avatar
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    I think "long long" is the long-long-winded, yet correct choice. Might as well typedef it away.

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