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"
"math"
"os"
"strconv"
)
// This program contains a lot of comments
// Non-commented version is in /without-comments/main.go
func main() {
// You cannot use this syntax.
//
// feetInMeters is declared
// when the declaration completes,
// (at the end of the whole declaration)
//
// And, it's not easy to read
//
// const feetInMeters, feetInYards float64 = 0.3048,
// feetInMeters / 0.9144
const (
feetInMeters = 0.3048
feetInYards = feetInMeters / 0.9144
// cannot call runtime funcs
// feetInYards = math.Round(feetInYards)
)
// Immutable: You cannot assign new values
// feetInYards = 0.333333
arg := os.Args[1]
feet, _ := strconv.ParseFloat(arg, 64)
meters := feet * feetInMeters
yards := math.Round(feet * feetInYards)
fmt.Printf("%g feet is %g meters.\n", feet, meters)
fmt.Printf("%g feet is %g yards.\n", feet, yards)
}
你可能感兴趣的文章
go main
go main
go main
go main
go main
go Header
go main
go main
go main
go main