https://developer.apple.com/documentation/foundation/userdefaults/1414005-synchronize Waits for any pending asynchronous updates to the defaults database and returns; this method is unnecessary and shouldn't be used. かつては UserDefaults …

import Foundation func kelvin2Celsius(_ kelvin: Float) -> Float { return kelvin - 273.15 } func celsius2Kelvin(_ celsius: Float) -> Float { return celsius + 273.15 } func kelvin2Fahrenheit(_ kelvin: Float) -> Float { return kelvin * (9.0 /…