No while() loop, only bit operation. (C)

  • 1
    int hammingWeight(uint32_t n) {
        n = (n&0x55555555)+((n>>1)&0x55555555);
        n = (n&0x33333333)+((n>>2)&0x33333333);
        n = (n&0x0f0f0f0f)+((n>>4)&0x0f0f0f0f);
        n = (n&0x00ff00ff)+((n>>8)&0x00ff00ff);
        n = (n&0x0000ffff)+((n>>16)&0x0000ffff);
        return n;

    Using devide and conquer.
    In Hacker's delight, we can find this problem!

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