C / C++ / MFC

float htonf(float value)
{
  float result;
  char* pSource = reinterpret_cast<char*>(&value);
  char* pDest = reinterpret_cast<char*>(&result);
  pDest[0] = pSource[3];
  pDest[1] = pSource[2];
  pDest[2] = pSource[1];
  pDest[3] = pSource[0];
  return result;
}

double htonf(double value)
{
  double result;
  char* pSource = reinterpret_cast<char*>(&value);
  char* pDest = reinterpret_cast<char*>(&result);
  pDest[0] = pSource[7];
  pDest[1] = pSource[6];
  pDest[2] = pSource[5];
  pDest[3] = pSource[4];
  pDest[4] = pSource[3];
  pDest[5] = pSource[2];
  pDest[6] = pSource[1];
  pDest[7] = pSource[0];
  return result;
}

bool IsBigEndian()
{
  int i = 1;
  char* p = reinterpret_cast<char*>(&i);
  return *p == 0;
}

float htonf(float value)
{
  if(IsBigEndian())
    return value;

  float result;
  char* pSource = reinterpret_cast<char*>(&value);
  char* pDest = reinterpret_cast<char*>(&result);
  pDest[0] = pSource[3];
  pDest[1] = pSource[2];
  pDest[2] = pSource[1];
  pDest[3] = pSource[0];
  return result;
}

Graham Shanks wrote:

The assumption here is that float is a single precision IEEE 754 binary floating point and double is a double precision IEEE 754 binary floating point

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hrishiS wrote:

I assumed it as variable argument.