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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.     int bits_needed(uint32_t value)
  5.     {
  6.         int bits = 0;
  7.         if (value >= 0x10000)
  8.         {
  9.             bits += 16;
  10.             value >>= 16;
  11.         }
  12.         if (value >= 0x100)
  13.         {
  14.             bits += 8;
  15.             value >>= 8;
  16.         }
  17.         if (value >= 0x10)
  18.         {
  19.             bits += 4;
  20.             value >>= 4;
  21.         }
  22.         if (value >= 0x4)
  23.         {
  24.             bits += 2;
  25.             value >>= 2;
  26.         }
  27.         return bits + value;
  28.     }
  29.  
  30. int main() {
  31. 	cout << bits_needed(30665) << endl;
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 3296KB
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https://ideone.com/1iH7hG
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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