for expr,res in [
     ['2+3'                                      =>        5],
     ['-4-3'                                     =>       -7],
     ['-+2+3/4'                                  =>    -1.25],
     ['2*3-4'                                    =>        2],
     ['2*(3+4)+2/4'                              => 2/4 + 14],
     ['2*-3--4+-0.25'                            =>    -2.25],
     ['2 * (3 + (4 * 5 + (6 * 7) * 8) - 9) * 10' =>     7000],
] { 
    var num = evalArithmeticExp(expr)
    assert_eq(num, res)
    "%-45s == %10g\n".printf(expr, num)
}