finished chapter 9

playground/fuel.go

@@ -6,11 +6,44 @@ import "fmt"
 
 type Liters float64
 type Gallons float64
+type Milliliters float64
+
+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() {
-	var carFuel Gallons
-	var busFuel Liters
-	carFuel = Gallons(10.0)
-	busFuel = Liters(240.0)
-	fmt.Println(carFuel, busFuel)
+	// 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())
 }