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

// See page 29.
//!+

// Ftoc prints two Fahrenheit-to-Celsius conversions.
package main

import "fmt"

func main() {
	const freezingF, boilingF = 32.0, 212.0
	fmt.Printf("%g°F = %g°C\n", freezingF, fToC(freezingF)) // "32°F = 0°C"
	fmt.Printf("%g°F = %g°C\n", boilingF, fToC(boilingF))   // "212°F = 100°C"
}

func fToC(f float64) float64 {
	return (f - 32) * 5 / 9
}

//!-