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Home/ Questions/Q 3783372
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Editorial Team
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Editorial Team
Asked: May 19, 20262026-05-19T11:12:55+00:00 2026-05-19T11:12:55+00:00

Say I have two positive numbers a and b. How many bits must be

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Say I have two positive numbers a and b. How many bits must be inverted in order to convert a into b ?
I just want the count and not the exact position of the differing bits.

Lets assume a = 10 ( 1010 ) and b = 8 ( 1000 ). In this case the number of bits that should be inverted equals 1.

Any generalised algorithm?

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  1. Editorial Team
    Editorial Team
    2026-05-19T11:12:55+00:00Added an answer on May 19, 2026 at 11:12 am

    The solution is simple

    • Step 1 ) Compute a XOR b
    • Step 2 ) Count the number of set bits in the result

    Done!

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