go main

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/rand"
	"os"
	"strconv"
	"time"
)

const (
	maxTurns = 5 // less is more difficult
	usage    = `Welcome to the Lucky Number Game! 🍀

The program will pick %d random numbers.
Your mission is to guess one of those numbers.

The greater your number is, harder it gets.

Wanna play?
`
)

func main() {
	rand.Seed(time.Now().UnixNano())

	args := os.Args[1:]

	if len(args) != 1 {
		fmt.Printf(usage, maxTurns)
		return
	}

	guess, err := strconv.Atoi(args[0])
	if err != nil {
		fmt.Println("Not a number.")
		return
	}

	if guess <= 0 {
		fmt.Println("Please pick a positive number.")
		return
	}

	for turn := 1; turn <= maxTurns; turn++ {
		n := rand.Intn(guess) + 1

		// Better, why?
		//
		// Instead of nesting the if statement into
		//   another if statement; it simply continues.
		//
		// TLDR: Avoid nested statements.
		if n != guess {
			continue
		}

		if turn == 1 {
			fmt.Println("🥇 FIRST TIME WINNER!!!")
		} else {
			fmt.Println("🎉  YOU WON!")
		}
		return
	}

	fmt.Println("☠️  YOU LOST... Try again?")
}

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