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Home/ Questions/Q 6862827
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T02:42:30+00:00 2026-05-27T02:42:30+00:00

What does a 0x prefix on a number mean? const int shared_segment_size = 0x6400;

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What does a 0x prefix on a number mean?

const int shared_segment_size = 0x6400;

It’s from a C program. I can’t recall what it amounts to and particularly what the letter x means.

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  1. Editorial Team
    Editorial Team
    2026-05-27T02:42:31+00:00Added an answer on May 27, 2026 at 2:42 am

    Literals that start with 0x are hexadecimal integers. (base 16)

    The number 0x6400 is 25600.

    6 * 16^3 + 4 * 16^2 = 25600
    

    For an example including letters (also used in hexadecimal notation where A = 10, B = 11 … F = 15)

    The number 0x6BF0 is 27632.

    6 * 16^3 + 11 * 16^2 + 15 * 16^1 = 27632
    24576    + 2816      + 240       = 27632
    
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