swift convert form C To F

import Foundation

print ("1 from f to c")
print ("2 from c to f")

var result = readLine()!



if (Int (result) == 1) {
    var f = readLine()!
 var c = 5.0/9.0 * (Double (f)! - 32)
    print ("C:",c)


}else if (Int (result) == 2){
    var c = readLine()!
   var f = 9.0/5.0 * Double (c)! + 32
    print ("f:",f)

} else {
    print ("please chose 1 or 2")
}