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package temperature
import (
"errors"
"fmt"
)
type Unit int
const (
Celcius Unit = iota
Kelvin
Fahrenheit
)
type Temperature struct {
val float32
unit Unit
}
func New(i float32, u Unit) Temperature {
return Temperature{i, u}
}
func (t Temperature) As(u Unit) (float32, error) {
// Convert to celcius
var c float32
switch t.unit {
case Celcius:
c = t.val
case Kelvin:
c = t.val - 272.15
case Fahrenheit:
c = (t.val - 32.0) * (5.0 / 9.0)
}
// Convert to desired unit
switch u {
case Celcius:
return c, nil
case Kelvin:
return c + 272.15, nil
case Fahrenheit:
return c*(9.0/5.0) + 32.0, nil
default:
return 0, errors.New(fmt.Sprintf("invalid unit: '%v'", u))
}
}
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