func main() {
var unitType string = os.Args[1]
for _, arg := range os.Args[2:] {
v, err := strconv.ParseFloat(arg, 64)
if err != nil {
fmt.Fprintf(os.Stderr, "cf: %v\n", err)
os.Exit(1)
}
switch unitType {
case "l":
fallthrough
case "len":
fallthrough
case "length":
m := lenconv.Meter(v)
in := lenconv.Inch(v)
fmt.Printf("%s = %s, %s = %s\n",
m, lenconv.MToIn(m), in, lenconv.InToM(in))
case "t":
fallthrough
case "temp":
fallthrough
case "temperature":
f := tempconv.Fahrenheit(v)
c := tempconv.Celsius(v)
fmt.Printf("%s = %s, %s = %s\n",
f, tempconv.FToC(f), c, tempconv.CToF(c))
}
}
}
func main() {
fmt.Printf("Brrrr! %v\n", tempconv.AbsoluteZeroC) // "Brrrr! -273.15°C"
fmt.Println(tempconv.CToF(tempconv.BoilingC)) // "212°F"
//練習 2.1： 向tempconv包添加類型、常量和函數用來處理Kelvin絶對溫度的轉換，Kelvin 絶對零度是−273.15°C，Kelvin絶對溫度1K和攝氏度1°C的單位間隔是一樣的。
}
func main() {
for _, arg := range os.Args[1:] {
t, err := strconv.Parse - Float(arg, 64)
if err != nil {
fmt.Fprintf(os.Stderr, "cf: %v\n", err)
os.Exit(1)
}
f := tempconv.Fahrenheit(t)
c := tempconv.Celsius(t)
fmt.Printf("%s = %s, %s = %s\n", f, tempconv.FToC(f), c, tempconv.CToF(c))
}
}