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  1. #include <bitset>
  2. #include <cmath>
  3. #include <iostream>
  4.  
  5. const int kExponentBits = 11;
  6. const int kSignificandBits = 52;
  7.  
  8. std::bitset<kExponentBits + kSignificandBits + 1> FloatToBinaryIEEE754(double x) {
  9.   if (x == 0) {
  10.     return 0;
  11.   } else if (std::isinf(x)) {
  12.     return (1ull << kExponentBits + kSignificandBits) |
  13.            ((x < 0) << (kExponentBits + kSignificandBits));
  14.   } else if (std::isnan(x)) {
  15.     return (1ull << kExponentBits + kSignificandBits) |
  16.            (1ull << (kExponentBits - 1)) | 1;
  17.   }
  18.  
  19.   int exponent;
  20.   double significand = frexp(x, &exponent);
  21.   exponent += (1 << (kExponentBits - 1)) - 1;
  22.  
  23.   std::bitset<kExponentBits + kSignificandBits + 1> result;
  24.   result = (unsigned long long)(significand * (1ull << kSignificandBits)) &
  25.            ((1ull << kSignificandBits) - 1);
  26.   result |= (unsigned long long)(exponent) << kSignificandBits;
  27.   result |= (x < 0) << (kExponentBits + kSignificandBits);
  28.   return result;
  29. }
  30.  
  31. int main() {
  32.   double x = 0.25;
  33.   std::bitset<kExponentBits + kSignificandBits + 1> binary = FloatToBinaryIEEE754(x);
  34.   std::cout << binary << std::endl;
  35.   return 0;
  36. }
  37.  
Success #stdin #stdout 0.01s 5504KB
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stdin
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Standard input is empty
stdout
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0011111111101000000000000000000000000000000000000000000000000000
https://ideone.com/SSdG7j
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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