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  1.     #include <iostream>
  2.  
  3.     unsigned int power_of_2(unsigned int x) {
  4.         for(size_t p2 = 0; p2 < sizeof(x)*8; ++p2) {
  5.     	    if(x & (1 << p2)) {
  6.     		    return p2;
  7.     	    }
  8.         }
  9.         return 0;
  10.     }
  11.  
  12.     int main() {
  13. 	    std::cout << power_of_2(0x0080) << " "
  14. 	              << power_of_2(0x0040) << " "
  15. 	              << power_of_2(0x0020) << " "
  16. 	              << power_of_2(0x0010) << " "
  17.                   << std::endl;
  18. 	    return 0;
  19.     }
Success #stdin #stdout 0s 3296KB
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7 6 5 4
https://ideone.com/1JNFAY
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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