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"
"os"
"strconv"
)
func main() {
// WHY ADDING YOUR OWN TYPES IS IMPORTANT?
//
// 1. Type-Safety
// 2. Increased Readability
// 3. Adding Methods to your Types
type (
Feet float64
Meters float64
)
var (
feet Feet
meters Meters
)
arg := os.Args[1]
// feet is a Feet value now
val, _ := strconv.ParseFloat(arg, 64)
feet = Feet(val)
// meters is a Meters value now
meters = Meters(feet * 0.3048)
fmt.Printf("%g feet is %g meters.\n", feet, meters)
}
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