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Home/ Questions/Q 944141
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T22:32:44+00:00 2026-05-15T22:32:44+00:00

How can access the lower half of a 64bit integer using C or C++?

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How can access the lower half of a 64bit integer using C or C++? I can do it easily in Assembly but I have no clue on how to do it in C/C++

EDIT: What about accessing the upper half?

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  1. Editorial Team
    Editorial Team
    2026-05-15T22:32:45+00:00Added an answer on May 15, 2026 at 10:32 pm
    long long BigOne = 0x1234567890ABCDEFLL;
    long long LowerHalf = BigOne & 0xFFFFFFFFLL;
    long long UpperHalf = (BigOne >> 32) & 0xFFFFFFFFLL;
    

    Sorry if the hexadecimal literals require some prefix/suffix, I’m not very familiar with C. Please fix the answer if you know.

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