#include <cstdint>
#include <cmath>
#include <iostream>
 
// convert IEEE 754 double precision floating-point number to binary
int main() {
  double d = 3.14; // example number
 
  // extract components of double
  uint64_t sign = (d < 0) ? 1 : 0;
  uint64_t exponent = (uint64_t) log2(std::abs(d));
  double mantissa = std::abs(d) / pow(2, exponent);
 
  // convert components to binary
  uint64_t sign_bin = sign << 63;
  uint64_t exponent_bin = exponent << 52;
  uint64_t mantissa_bin = (uint64_t) (mantissa * (double) (1UL << 52));
 
  // combine components to form IEEE 754 double precision binary
  uint64_t binary = sign_bin | exponent_bin | mantissa_bin;
 
  // print binary
  std::cout << std::hex << binary << std::endl;
 
  return 0;
}

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