Unit Converter

package main

import "fmt"

type Celsius float64
type Fahrenheit float64
type Kelvin float64

const (
	AbsoluteZeroC Celsius = -273.15
	BoilingPointC Celsius = 100.0
	FreezingPointC Celsius = 0.0
)

func (c Celsius) ToFahrenheit() Fahrenheit {
	return Fahrenheit(c*9/5 + 32)
}

func (c Celsius) ToKelvin() Kelvin {
	return Kelvin(c + 273.15)
}

func (f Fahrenheit) ToCelsius() Celsius {
	return Celsius((f - 32) * 5 / 9)
}

func (k Kelvin) ToCelsius() Celsius {
	return Celsius(k - 273.15)
}

func main() {
	temperatures := []Celsius{AbsoluteZeroC, FreezingPointC, 37.0, BoilingPointC}

	fmt.Printf("%-12s | %-12s | %-12s\n", "Celsius", "Fahrenheit", "Kelvin")
	fmt.Println("-------------+--------------+-------------")

	for _, c := range temperatures {
		f := c.ToFahrenheit()
		k := c.ToKelvin()
		fmt.Printf("%8.2f °C  | %8.2f °F  | %8.2f K\n", c, f, k)
	}

	fmt.Println()

	// Demonstrate explicit type conversion requirement
	var unset Celsius // zero value
	fmt.Printf("Zero value of Celsius: %.2f °C\n", unset)
	fmt.Printf("Body temp in Kelvin: %.2f K\n", Celsius(37.0).ToKelvin())

	// Convert from Fahrenheit back to Celsius
	boiling := Fahrenheit(212)
	fmt.Printf("%.0f °F = %.2f °C\n", boiling, boiling.ToCelsius())
}