main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import "fmt"
// REFACTORED VERSION
// It uses well-defined names instead of magic numbers.
// Thanks to the keyed elements and constants.
func main() {
const (
ETH = 9 - iota
WAN
ICX
// you can add more cryptocurrencies here
// watch out the -1 index though!
)
rates := [...]float64{
ETH: 25.5,
WAN: 120.5,
ICX: 20,
// you can add more cryptocurrencies here
}
// uses well-defined names (ETH, WAN, ...) - good
fmt.Printf("1 BTC is %g ETH\n", rates[ETH])
fmt.Printf("1 BTC is %g WAN\n", rates[WAN])
fmt.Printf("1 BTC is %g ICX\n", rates[ICX])
fmt.Printf("%#v\n", rates)
}
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