ref: 1c424b1b4d5931f2a4b87b6f0f75827bc53ff9d7
dir: /testdir/t.arith/
{ print NR, $1, $1+$1, $1-$1, $1 * $1 }
{ print NR, $1/NR, $1 % NR }
# { print NR, $1++, $1--, --$1, $1-- } # this depends on order of eval of args!
{ print NR, -$1 }
$1 > 0 { print NR, $1 ^ 0.5 }
$1 > 0 { print NR, $1 ** 0.5 }