import Cocoa
func raznosti(y:[Double],xar:[Double],n:Int,x0:Double,h:Double,x:Double) {
  var d = y
  for k in 1...n {
    for i in (k...n).reversed() {
      d[i] = (d[i]-d[i-1])/(xar[i]-xar[i-k])
    }
  }

  var p = y[0]
  var u = 1.0
  for i in 1...n {
    let xi = x0+Double((i-1))*h
    u = u*Double((x-xi))/Double((Double(i)-h))
    p = p+d[i]*u
  }
  print(p)
}
let yarr = [asin(0.0),asin(0.1),asin(0.2),asin(0.3)]
print(yarr)
raznosti(y: yarr, xar: [0,0.1,0.2,0.3], n: 1, x0: 0, h: 0.1, x: 0.15)
print(asin(0.15))