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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/

// See page 43.
//!+

// Cf converts its numeric argument to Celsius and Fahrenheit.
package main

import (
    "fmt"
    "os"
    "strconv"

    "gopl.io/ch2/tempconv"
)

func main() {
    for _, arg := range os.Args[1:] {
        t, err := strconv.ParseFloat(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))
    }
}

//!-