package calc

import "fmt"


func Calc(a, b float64, o string) (float64, error) {
	
	switch o {
	case "+":
		return sum(a, b), nil
	case "-":
		return sub(a, b), nil 
	case "*":
		return mul(a, b), nil
	case "/":
		return div(a, b), nil
	}
	return 0, fmt.Errorf("Uknown operation")
}

func sum(a, b float64) float64 {
	return a + b
}

func sub(a, b float64) float64 {
	return a - b
}

func mul(a, b float64) float64 {
	return a * b
}

func div(a, b float64) float64 {
	return a / b
}