File: main.c

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

int main (int argc, char **argv) {
  float f = -0x1p-129f;
  float g =  0x1p-129f;
  float target = 0x0;

  float result = f + g;

  assert(result == target);

  #ifndef _MSC_VER
  assert(signbit(result) == signbit(target));
  #endif

  return 0;
}