import Foundation

/* * Define an ErrorType */ enum StringToIntTypecastingError: Error { case BadString }

func stringToInt(inputString: String) throws -> Int {
    guard let int = Int(inputString) else {
        throw StringToIntTypecastingError.BadString
    }
    return int
}

/* * Read the input */ let inputString = readLine()!

do { try print(stringToInt(inputString: inputString)) } catch StringToIntTypecastingError.BadString { print("Bad String") }

**// I am getting Error reading result file.You should use exception handling concepts.

but output printing correct can any one please help in this in Swift language **