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191. 求1的位数 Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of ’1‘ bits it has (also known as the Hamming weight).

For example, the 32-bit integer ’11‘ has binary representation 00000000000000000000000000001011, so the function should return 3.

求一个无符号整形转换成二进制后,为1的位数
  1. public int HammingWeight(uint n) {
  2. int sum = 0;
  3. while (n > 0)
  4. {
  5. if ((n&1) == 1)
  6. {
  7. sum++;
  8. }
  9. n >>= 1;
  10. }
  11. return sum;
  12. }



来自为知笔记(Wiz)


191. 求1的位数 Number of 1 Bits