编写一个Conversions对象加入 inchesToCentimetersgallonsToLiters和 milesToKilometers 方法。scala

object Conversions { def inchesToCentimeters(inches: Double): Double = { inches * 2.54 }

def gallonsToLiters(gallons: Double): Double = { gallons * 3.78541 }

def milesToKilometers(miles: Double): Double = { miles * 1.60934 } }