package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	randTest()

	randAnswer()
}

func randTest() {
	//1、通過預設的隨機數種子獲取隨機數.
	//系統預設的rand物件，隨機種子預設都是1
	fmt.Println(rand.Int())
	fmt.Println(rand.Intn(50
 
))
	fmt.Println(rand.Float64())

	//	2、動態隨機種子，生成隨機資源，例項化成隨機物件，通過隨機物件獲取隨機數
	s1 := rand.NewSource(time.Now().UnixNano())
	r1 := rand.New(s1)
	randnum := r1.Intn(10)
	fmt.Println(randnum)

	//3、簡寫形式：動態種子來獲取隨機數
	//	[0,10]
	rand.Seed(time.Now().UnixNano())
	fmt.Println(rand.Intn(10))

	fmt.Println(rand.Float64())

	//[5,11]
	num := rand.Intn(7
 
) + 5
	fmt.Println(num)
}

func randAnswer() {
	answers := []string{
		"It is certain",
		"It is decidedly so",
		"Without a doubt",
		"Yes definitely",
		"You may rely on it",
		"As I see it yes",
		"Most likely",
		"Outlook good",
		"Yes",
		"Signs point to yes",
		"Reply hazy try again",
		"Ask again later",
		"Better not tell you now"
 
,
		"Cannot predict now",
		"Concentrate and ask again",
		"Don't count on it",
		"My reply is no",
		"My sources say no",
		"Outlook not so good",
		"Very doubtful",
	}
	rand.Seed(time.Now().UnixNano())
	randnum := rand.Intn(len(answers))
	fmt.Println("隨機回答", answers[randnum])
}