package main

import "math"

func main() {
	catalog := map[string]interface{}{
		"+":    func(x, y int) int { return x + y },
		"-":    func(x, y int) int { return x - y },
		"*":    func(x, y int) int { return x * y },
		"/":    func(x, y int) int { return x / y },
		"^2":   func(x int) int { return x * x },
		"SQRT": func(x int) int { return int(math.Sqrt(float64(x))) },
		"C":    func() { /* TODO: need engine object */ },
		"AC":   func() { /* TODO: need engine object */ },
	}
}