trying_out_go/cmd/playground/fuel.go

// part of chapter 9

package main

import "fmt"

type Liters float64

func (l Liters) String() string {
	return fmt.Sprintf("%0.2f L", l)
}

type Gallons float64

func (g Gallons) String() string {
	return fmt.Sprintf("%0.2f gal", g)
}

type Milliliters float64

func (m Milliliters) String() string {
	return fmt.Sprintf("%0.2f mL", m)
}

func (l Liters) ToGallons() Gallons {
	return Gallons(l * 0.264)
}

func (m Milliliters) ToGallons() Gallons {
	return Gallons(m * 0.000264)
}

func (g Gallons) ToLiters() Liters {
	return Liters(g * 3.785)
}

func (g Gallons) ToMilliliters() Milliliters {
	return Milliliters(g * 3785.41)
}

func fuel() {
	// long version
	//var carFuel Gallons
	//var busFuel Liters
	//carFuel = Gallons(10.0)
	//busFuel = Liters(240.0)
	// short version
	soda := Liters(2)
	fmt.Printf("%0.0f liters equals %0.3f gallons\n", soda, soda.ToGallons())
	water := Milliliters(500)
	fmt.Printf("%0.0f milliliters equals %0.3f gallons \n", water, water.ToGallons())
	//carFuel := Gallons(10.0)
	//busFuel := Liters(240.0)
	//
	////if you want to convert between types, save variable with correct calculation
	//carFuel += ToGallons(Liters(40.0))
	//busFuel += ToLiters(Gallons(30.0))
	//fmt.Printf("Car Fuel: %0.1f gallons\n", carFuel)
	//fmt.Printf("Bus Fuel: %0.1f liters\n", busFuel)
	milk := Gallons(2)
	fmt.Printf("%0.0f gallons equals %0.3f liters\n", milk, milk.ToLiters())
	fmt.Printf("%0.0f gallons equals %0.3f milliliters\n", milk, milk.ToMilliliters())
	fmt.Println(Gallons(12.09285934))
	fmt.Println(Liters(12.09285934))
	fmt.Println(Milliliters(12.09285934))
}