szub

var a:Double
var b:Double

print("Liczenie pola i obwodu figur")
print("1. Kwadrat")
print("2. Prostakat")
print("3. Trojkat")
print("4. Zakoncz program")
print("Twoj wybor:")
let choice = readLine()

switch choice{
  case "1":
    print("Podaj bok a kwadratu")
    a = Double(readLine()!)
    print(square(sideA: a))
  case "2":
    print("Podaj bok a prostokata")
    a = Double(readLine()!)
    print("Podaj bok b prostokata")
    b = Double(readLine()!)
    print(rectangle(sideA: a, sideB: b))
  case "3":
    print("Podaj podstawe a trojkata")
    a = Double(readLine()!)
    print("Podaj wysokosc b trojkata")
    b = Double(readLine()!)
    print(triangle(sideA: a, sideB: b))
  default:
    print("Ta opcja nie istnieje!")
}
func square(sideA: Double) -> Double {
  let result = "Pole kwadratu = " + sideA*sideA + "Obwod kwadratu = " + sideA*4
   return result
}

func rectangle(sideA: Double, sideB: Double) -> Double {
   let result = "Pole prostokata = " + sideA*sideB + "Obwod prostokata = " + sideA*2+sideB*2
   return result
}

func triangle(sideA: Double, sideB: Double, sideC: Double) -> Double {
   let result = "Pole trojkata = " + (sideA*sideB)/2 + "Obwod trojkata = " + sideA+sideB+sideC
   return result
}