func TestDentaku(t *testing.T) {
assert := func(expr string, expected eval.Rational) {
r := strings.NewReader(expr)
a := parser.Parse(r)
got := eval.Evaluate(a)
if expected != got {
t.Errorf("Expected %s, but got %s", expected, got)
}
}
assert("1+1", eval.Rational{Numer: 2, Decom: 1})
assert("1-2", eval.Rational{Numer: -1, Decom: 1})
assert("3*2", eval.Rational{Numer: 6, Decom: 1})
assert("24/2", eval.Rational{Numer: 12, Decom: 1})
assert("24/16", eval.Rational{Numer: 3, Decom: 2})
assert("(1+2)*(3-5)", eval.Rational{Numer: -6, Decom: 1})
assert("1+3/6", eval.Rational{Numer: 3, Decom: 2})
}
func main() {
a := parser.Parse(os.Stdin)
ret := eval.Evaluate(a)
fmt.Println(ret)
}