VoltageDivider.swift

//: Playground - noun: a place where people can play

import UIKit
//import Foundation

var Vin:Double = 400
var r1:Double = 100
var r2:Double = 5
var Vout:Double = Vin * (r1 / (r1 + r2))
print(Vout)

if let value = NSExpression(format: "Vin * (r1 / (r1+r2))")
               .expressionValue(with: ["Vin":Vin,
                                       "r1":r1,
                                       "r2":r2],
                                context: nil) {
  print(value)
}