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enum InvalidOperatorError: Error {
case operatorNotSupported
}
func calculate(operatorThing: String, number1: Float, number2: Float) throws -> Float {
switch operatorThing {
case "+":
return number1 + number2
case "-":
return number1 - number2
case "/":
return number1 / number2
case "*":
return number1 * number2
default:
throw InvalidOperatorError.operatorNotSupported
}
}
func main() {
print("enter a number:")
let number1 = Float(readLine()!)!
print("enter an operator:")
let operatorThing = readLine()!
print("enter another number:")
let number2 = Float(readLine()!)!
do {
let result = try calculate(operatorThing: operatorThing, number1: number1, number2: number2)
print(result)
} catch InvalidOperatorError.operatorNotSupported {
print("invalid operator!")
return
} catch {
print("unexpected error!")
return
}
}
main()
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