/**
* Convert Celsius temperature to Fahrenheit
*/
fun Double.toFahrenheit(): Double = (this * 1.8) + 32
, /**
* Convert Fahrenheit temperature to Celsius
*/
fun Double.toCelsius(): Double = (this - 32) * 5 / 9
, /**
* Convert meters to miles
*/
fun Double.toMiles(): Double {
return if (this != 0.0) {
this / 1609.34
} else -1.0
}