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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4.     unsigned int v = 0xCF31; // some number
  5.     v = v - ((v >> 1) & 0x55555555);                    // reuse input as temporary
  6.     v = (v & 0x33333333) + ((v >> 2) & 0x33333333);     // temp
  7.     unsigned int c = ((v + (v >> 4) & 0xF0F0F0F) * 0x1010101) >> 24; // count
  8.     printf("%u\n", c);
  9.     return 0;
  10. }
Success #stdin #stdout 0.01s 1720KB
comments (?)
stdin 
Standard input is empty
stdout 
9
https://ideone.com/9FUXX
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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