conv_tst.c

linux下编程用 编译软件

#define ID_1 2400000000.0
#define ID_2 1.7
#define ID_3 -1.7

unsigned ui;
int si;

conv_i1 ()
{
/*
  ui = (unsigned) ID_1;
  si = (int) ID_1;
*/
}

conv_i2 ()
{
  ui = (unsigned) ID_2;
  si = (int) ID_2;
}

conv_i3 ()
{
/*  ui = (unsigned) ID_3;*/
  si = (int) ID_3;
}

conv_1 (d)
     double d;
{
  ui = (unsigned) d;
/*
  si = (int) d;
*/
}

double
foo (u)
     unsigned u;
{
  return u;
}

main ()
{
  printf ("%lf\n", foo (2400000000));

  conv_i1 ();
  printf ("%lf, %u, %d\n", ID_1, ui, si);

  conv_i2 ();
  printf ("%lf, %u, %d\n", ID_2, ui, si);

  conv_i3 ();
  printf ("%lf, %u, %d\n", ID_3, ui, si);

  conv_1 (ID_1);
  printf ("%lf, %u, %d\n", ID_1, ui, si);

  conv_1 (ID_2);
  printf ("%lf, %u, %d\n", ID_2, ui, si);

  conv_1 (ID_3);
  printf ("%lf, %u, %d\n", ID_3, ui, si);

}