File: main.c

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#include <assert.h>
#include <math.h>
#include <float.h>

int main() {
  double xxx;

  // Visual Studio needs to be 2013 onwards
  #if defined(_MSC_VER) && !defined(__CYGWIN__) && _MSC_VER < 1800

  // see http://www.johndcook.com/math_h.html

  #else
  assert(fpclassify(DBL_MAX+DBL_MAX)==FP_INFINITE);
  assert(fpclassify(0*(DBL_MAX+DBL_MAX))==FP_NAN);
  assert(fpclassify(1.0)==FP_NORMAL);
  assert(fpclassify(DBL_MIN)==FP_NORMAL);
  assert(fpclassify(DBL_MIN/2)==FP_SUBNORMAL);
  assert(fpclassify(-0.0)==FP_ZERO);
  #endif

  assert(signbit(-1.0)!=0);
  assert(signbit(1.0)==0);
}