package main

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

func main() {
randTest()

randAnswer()
}

func randTest() {
//1、通過默認(rèn)的隨機(jī)數(shù)種子獲取隨機(jī)數(shù).
//系統(tǒng)默認(rèn)的rand對象，隨機(jī)種子默認(rèn)都是1
fmt.Println(rand.Int())
fmt.Println(rand.Intn(50))
fmt.Println(rand.Float64())

//	2、動(dòng)態(tài)隨機(jī)種子，生成隨機(jī)資源，實(shí)例化成隨機(jī)對象，通過隨機(jī)對象獲取隨機(jī)數(shù)
s1 := rand.NewSource(time.Now().UnixNano())
r1 := rand.New(s1)
randnum := r1.Intn(10)
fmt.Println(randnum)

//3、簡寫形式：動(dòng)態(tài)種子來獲取隨機(jī)數(shù)
//	[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(jī)回答", answers[randnum])
}