bit count in c (1)

bg090721

=============================运行结果
4296000 -> 10000011000110101000000
  a1_bitcount: num of 1=7, time=782 ms
  a2_bitcount: num of 1=7, time=265 ms
  a3_bitcount: num of 1=7, time=938 ms
  a4a_bitcount: num of 1=7, time=78 ms
  a4b_bitcount: num of 1=7, time=62 ms
=============================运行结果end