func main() {
scanner := bufio.NewScanner(os.Stdin)
for {
fmt.Print("> ")
if !scanner.Scan() {
break
}
expr, err := eval.Parse(scanner.Text())
if err != nil {
fmt.Println(err)
continue
}
if err = expr.Check(map[eval.Var]bool{}); err != nil {
fmt.Println(err)
continue
}
fmt.Println(expr.Eval(eval.Env{}))
}
}
func main() {
expr, _ := eval.Parse("x ? y")
fmt.Println(expr.Eval(eval.Env{"x": 10, "y": 20}))
}
func main() {
expr, _ := eval.Parse("pow(x + pow(y))")
fmt.Println(expr.String())
}