make clean h1.x

echo '-------- ' no arg
./h1.x

for i in -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 \
         0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
  # omit 11 on Mac OS X, run that case manually
do
  echo '-------- ' arg $i
  ./h1.x $i
done