Alan A. A. Donovan and Brian W. Kernighan, The Go Programming Language. Addison-Wesley, 2016, Chapter 2, Program Structure, Exercise 2.1

See also Go: Program structure

scratch.go

1
2
3
4
5
6
7
8
9
10

package main

import (
    "fmt"
    "./temp"
)

func main() {
    fmt.Println(tempconv.KToC(300))
}

tempconv.go, in directory ./temp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

package tempconv

import "fmt"

type Celsius float64
type Fahrenheit float64
type Kelvin float64

const (
    AbsoluteZeroC Celsius = -273.15
    BoilingC Celsius = 100
    FreezingC Celsius = 0
)

func(c Celsius) String() string {
    return fmt.Sprintf("%g°C", c)
}

func(f Fahrenheit) String() string {
    return fmt.Sprintf("%g°F", f)
}

func(k Kelvin) String() string {
    return fmt.Sprintf("%g°K", k)
}

conv.go, in directory ./temp

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

package tempconv

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

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

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

func KToF(k Kelvin) Fahrenheit {
    return Fahrenheit(k * 9/5 - 459.67)
}