DCMTK

The following code shows that OFStandard::atof() can produce rounding errors that prevent a lossless round-trip e.g. from DICOM FD to JSON and back.
This sample program shows that OFStandard::atof() produces results that are different from those of std::stod():

#include "dcmtk/dcmdata/dcfilefo.h" 

int main() {
  std::string result;
  result = "14.399999999999999";
  OFBool success;
  double d2 = OFStandard::atof(result.c_str(), &success);
  std::cout << std::hexfloat << d2 << std::endl;
  double d3 = std::stod(result);
  std::cout << std::hexfloat << d3 << std::endl;

  return 0;
}

Reported 2024-01-11 by Mathieu Malaterre <mathieu.malaterre@gmail.com>