File: conv.c

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gcc-arm-none-eabi 15%3A7-2018-q2-6
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double
u2d (unsigned int u)
{
  return u;
}

double
i2d (signed int i)
{
  return i;
}

unsigned int
d2u (double d)
{
  return d;
}

signed int
d2i (double d)
{
  return d;
}

main ()
{
  printf ("%lf, %lf, %lf\n", u2d (~0), u2d (1 << 31), u2d (1));
  printf ("%lf, %lf, %lf\n", i2d (~0), i2d (1 << 31), i2d (1));

  printf ("%u, %u, %u\n", d2u (u2d (~0)), d2u (u2d (1 << 31)), d2u (u2d (1)));
  printf ("%d, %d, %d\n", d2i (i2d (~0)), d2i (i2d (1 << 31)), d2i (i2d (1)));
}