[Custom number types in Go] Shows how you can utilize the fact that using the keyword "type" in Go create a new type unlike typedef in C. Allows us work with numbers without mixing up the units.

degrees.go

package main

import (
    "fmt"
)

type Celsius float64

// Implement Stringer interface, used by %s in Printf
func (deg Celsius) String() string {
    return fmt.Sprintf("%.1f °C", float64(deg))
}

// Convert celisus to fahrenheit
func (deg Celsius) Fahrenheit() Fahrenheit {
    return Fahrenheit(float64(deg) * (9.0/5.0) + 32.0)
}

type Fahrenheit float64

// Implement Stringer interface, used by %s in Printf
func (deg Fahrenheit) String() string {
    return fmt.Sprintf("%.1f °F", float64(deg))
}

// Convert fahrenheit to celisus
func (deg Fahrenheit) Celsius() Celsius {
    return Celsius((float64(deg) - 32.0) * (5.0/9.0))
}

func main() {
    var bodyTemp Celsius = 37
    fmt.Printf("Body temprature is %s or %s\n", bodyTemp, bodyTemp.Fahrenheit())
}