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Asked: 2026-05-29T21:03:09+00:00

Reading or writing a C code, I often have difficulties translating the numbers from

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Reading or writing a C code, I often have difficulties translating the numbers from the binary to the hex representations and back. Usually, different masks like 0xAAAA5555 are used very often in low-level programming, but it’s difficult to recognize a special pattern of bits they represent. Is there any easy-to-remember rule how to do it fast in the mind?

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  1. Editorial Team

    Each hex digit map exactly on 4 bit, I usually keep in mind the 8421 weights of each of these bits, so it is very easy to do even an in mind conversion ie

    A = 10 = 8+2 = 1010 …
    5 = 4+1 = 0101

    just keep the 8-4-2-1 weights in mind.

    A        5     
8+4+2+1  8+4+2+1
1 0 1 0  0 1 0 1
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