Scala 单位转换工具：英寸到厘米、加仑到升、英里到公里

object Conversions {\ndef inchesToCentimeters(inches: Double): Double = {\n inches * 2.54\n}\n\ndef gallonsToLiters(gallons: Double): Double = {\n gallons * 3.78541\n}\n\ndef milesToKilometers(miles: Double): Double = {\n miles * 1.60934\n}\n}