Golang rand.Intn函数代码示例

func (h *ikr) Run(res *hal.Response) error {
	now := time.Now()
	rand.Seed(int64(now.Unix()))
	//only fire half the time
	if rand.Intn(100) >= 50 {
		return nil
	}
	replies := []string{
		"*I know right?!*",
		"*OMG* couldn't agree more",
		":+1:",
		"+1",
		":arrow_up: THAT",
		":arrow_up: you complete me :arrow_up:",
		"so true",
		"agreed.",
		"that's the fact jack",
		"YUUUUUUP",
		"that's what I'm talkin bout",
		"*IKR?!*",
		"singit",
		"^droppin the truth bombs :boom: :boom: :boom:",
		"#legit",
		"/me nodds emphatically in agreement",
		"for REALZ though",
		"FOR REALSIES",
		"it's like you *literally* just read my mind right now",
	}

	reply := replies[rand.Intn(len(replies)-1)]
	hal.Logger.Debug(" *** ikr:Sending response: %s", reply)
	res.Send(reply)
	return nil
}

func rnd() (sz []int) {
	sz = make([]int, rand.Intn(8)+1)
	for i := range sz {
		sz[i] = rand.Intn(10) + 1
	}
	return
}

// Initialize entities to random variables in order to test ledger status consensus
func (t *SimpleChaincode) initRand(stub *shim.ChaincodeStub, args []string) ([]byte, error) {
	var A, B string    // Entities
	var Aval, Bval int // Asset holdings
	var err error

	if len(args) != 4 {
		return nil, errors.New("Incorrect number of arguments. Expecting 4")
	}

	// Initialize the chaincode
	A = args[0]
	Aval = rand.Intn(100)
	B = args[1]
	Bval = rand.Intn(100)
	fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)

	// Write the state to the ledger
	err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
	if err != nil {
		return nil, err
	}

	err = stub.PutState(B, []byte(strconv.Itoa(Bval)))
	if err != nil {
		return nil, err
	}

	return nil, nil
}

func TestLXCConfig(t *testing.T) {
	runtime := mkRuntime(t)
	defer nuke(runtime)
	// Memory is allocated randomly for testing
	rand.Seed(time.Now().UTC().UnixNano())
	memMin := 33554432
	memMax := 536870912
	mem := memMin + rand.Intn(memMax-memMin)
	// CPU shares as well
	cpuMin := 100
	cpuMax := 10000
	cpu := cpuMin + rand.Intn(cpuMax-cpuMin)
	container, err := runtime.Create(&Config{
		Image: GetTestImage(runtime).ID,
		Cmd:   []string{"/bin/true"},

		Hostname:  "foobar",
		Memory:    int64(mem),
		CpuShares: int64(cpu),
	},
	)
	if err != nil {
		t.Fatal(err)
	}
	defer runtime.Destroy(container)
	container.generateLXCConfig(nil)
	grepFile(t, container.lxcConfigPath(), "lxc.utsname = foobar")
	grepFile(t, container.lxcConfigPath(),
		fmt.Sprintf("lxc.cgroup.memory.limit_in_bytes = %d", mem))
	grepFile(t, container.lxcConfigPath(),
		fmt.Sprintf("lxc.cgroup.memory.memsw.limit_in_bytes = %d", mem*2))
}

func (t1 *Test1) OnTick(account *accounts.Account, exchange *exchanges.Exchange, tick *ticks.Tick, vars *variables.Variables) {
	for _, trade := range account.OpenTrades() {
		someCriteria := true

		if someCriteria {
			exchange.CloseTrade(account, trade, tick)
		}

		return
	}

	lower := vars.GetFloat("ma_crossover_threshold_lower")
	upper := vars.GetFloat("ma_crossover_threshold_upper")

	currentCrossover := 1.23

	lots := 1.0
	stopLoss := 25.0
	takeProfit := 50.0

	if 0 == rand.Intn(1000) || currentCrossover > lower && currentCrossover < upper {
		if 0 == rand.Intn(2) {
			exchange.OpenLong(account, tick, lots, stopLoss, takeProfit)
		} else {
			exchange.OpenShort(account, tick, lots, stopLoss, takeProfit)
		}
	}
}

func NewBullet(boundary *gt2d.Rectangle) *Bullet {
	rand.Seed(time.Now().UTC().UnixNano())

	bullet := new(Bullet)
	bullet.Boundary = boundary

	// init with a random velocity and direction
	bullet.Velocity = new(gt2d.Vector2D)

	for {
		if abs(bullet.Velocity.X) > 1 && abs(bullet.Velocity.Y) > 1 {
			break
		}
		bullet.Velocity.X = rand.Intn(16) - 8
		bullet.Velocity.Y = rand.Intn(16) - 8
	}

	bullet.CurrentPosition = new(gt2d.Vector2D)
	bullet.LastPosition = new(gt2d.Vector2D)
	bullet.CurrentPosition.X = boundary.Width() / 2
	bullet.CurrentPosition.Y = boundary.Height() / 2
	bullet.LastPosition.X = bullet.CurrentPosition.X
	bullet.LastPosition.Y = bullet.CurrentPosition.Y

	bullet.Rect = gt2d.Rect(bullet.CurrentPosition.X-5, bullet.CurrentPosition.Y-5, bullet.CurrentPosition.X+5, bullet.CurrentPosition.Y+5)
	return bullet
}

func BenchmarkAddAndQueryPost(b *testing.B) {
	// Pre-build posts and queries so we're not measuring that.
	rand := rand.New(rand.NewSource(time.Now().UnixNano()))
	idx := &PostIndex{}
	posts := createPosts(aliceChain, 100000, rand) // Large number of posts to query
	for _, v := range posts {
		idx.AddPost(v.id, v.words)
	}

	posts = createPosts(aliceChain, b.N, rand) // New posts!
	queries := make([]string, b.N)
	for i := 0; i < len(queries); i++ {
		ql := rand.Intn(4) + 1
		t := aliceChain.Generate(ql, rand)
		w := splitToWords(t)
		queries[i] = randomQuery(w, rand)
	}
	var index int32 = -1 // Count up to N but atomically

	b.ResetTimer()
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			i := atomic.AddInt32(&index, 1)
			if rand.Intn(5) == 0 {
				p := posts[i]
				idx.AddPost(p.id, p.words)
			} else {
				q := queries[i]
				idx.QueryPosts(q, 100)
			}
		}
	})
}

// Benchmark that runs with parallelism to help find concurrency related
// issues. To run with parallelism, the 'go test' cpu flag must be set
// greater than 1, otherwise it just runs concurrently but not in parallel.
func BenchmarkParallelUdpParse(b *testing.B) {
	rand.Seed(22)
	numMessages := len(messages)
	dns := newDNS(false)
	client := dns.results.(*publish.ChanTransactions)

	// Drain the results channal while the test is running.
	go func() {
		totalMessages := 0
		for r := range client.Channel {
			_ = r
			totalMessages++
		}
		fmt.Printf("Parsed %d messages.\n", totalMessages)
	}()

	b.ResetTimer()
	b.RunParallel(func(pb *testing.PB) {
		// Each iteration parses one message, either a request or a response.
		// The request and response could be parsed on different goroutines.
		for pb.Next() {
			q := messages[rand.Intn(numMessages)]
			var packet *protos.Packet
			if rand.Intn(2) == 0 {
				packet = newPacket(forward, q.request)
			} else {
				packet = newPacket(reverse, q.response)
			}
			dns.ParseUDP(packet)
		}
	})

	defer close(client.Channel)
}

func createImage(iterations uint32, degree float64, factor float64) {
	// Declare image size
	width, height := 2048, 1024

	// Create a new image
	img := image.Rect(0, 0, width, height)
	c := NewCanvas(img)
	c.DrawGradient()

	rand.Seed(time.Now().UTC().UnixNano())
	for i := 0; i < 300; i++ {
		x := float64(width) * rand.Float64()
		y := float64(height) * rand.Float64()
		color := color.RGBA{uint8(rand.Intn(255)),
			uint8(rand.Intn(255)),
			uint8(rand.Intn(255)),
			255}
		c.DrawSpiral(color, Coordinate{x, y}, iterations, degree, factor)
	}

	name := fmt.Sprintf("spiral_%d_%f_%f.png", iterations, degree, factor)
	file, err := os.Create(name)
	if err != nil {
		log.Fatal(err)
	}

	defer file.Close()
	png.Encode(file, c)
}

func generateOneFile(fd io.ReadSeeker, p1 string, s int64) error {
	src := io.LimitReader(&inifiteReader{fd}, int64(s))
	dst, err := os.Create(p1)
	if err != nil {
		return err
	}

	_, err = io.Copy(dst, src)
	if err != nil {
		return err
	}

	err = dst.Close()
	if err != nil {
		return err
	}

	_ = os.Chmod(p1, os.FileMode(rand.Intn(0777)|0400))

	t := time.Now().Add(-time.Duration(rand.Intn(30*86400)) * time.Second)
	err = os.Chtimes(p1, t, t)
	if err != nil {
		return err
	}

	return nil
}

// TestList checks the returned list of keys after populating a directory tree.
func (suite *DriverSuite) TestList(c *check.C) {
	rootDirectory := "/" + randomFilename(int64(8+rand.Intn(8)))
	defer suite.StorageDriver.Delete(rootDirectory)

	parentDirectory := rootDirectory + "/" + randomFilename(int64(8+rand.Intn(8)))
	childFiles := make([]string, 50)
	for i := 0; i < len(childFiles); i++ {
		childFile := parentDirectory + "/" + randomFilename(int64(8+rand.Intn(8)))
		childFiles[i] = childFile
		err := suite.StorageDriver.PutContent(childFile, randomContents(32))
		c.Assert(err, check.IsNil)
	}
	sort.Strings(childFiles)

	keys, err := suite.StorageDriver.List("/")
	c.Assert(err, check.IsNil)
	c.Assert(keys, check.DeepEquals, []string{rootDirectory})

	keys, err = suite.StorageDriver.List(rootDirectory)
	c.Assert(err, check.IsNil)
	c.Assert(keys, check.DeepEquals, []string{parentDirectory})

	keys, err = suite.StorageDriver.List(parentDirectory)
	c.Assert(err, check.IsNil)

	sort.Strings(keys)
	c.Assert(keys, check.DeepEquals, childFiles)

	// A few checks to add here (check out #819 for more discussion on this):
	// 1. Ensure that all paths are absolute.
	// 2. Ensure that listings only include direct children.
	// 3. Ensure that we only respond to directory listings that end with a slash (maybe?).
}

/* 检查游戏是否已经胜利，没有胜利的情况下随机将值为0的元素
*随机设置为2或者4
 */
func (t *G4096) checkWinOrAdd() Status2 {
	// 判断4x4中是否有元素的值大于(等于)4096，有则获胜利
	for _, x := range t {
		for _, y := range x {
			if y >= Max2 {
				return Win2
			}
		}
	}
	// 开始随机设置零值元素为2或者4
	i := rand.Intn(len(t))
	j := rand.Intn(len(t))
	for x := 0; x < len(t); x++ {
		for y := 0; y < len(t); y++ {
			if t[i%len(t)][j%len(t)] == 0 {
				t[i%len(t)][j%len(t)] = 2 << (rand.Uint32() % 2)
				return Add2
			}
			j++
		}
		i++
	}

	// 全部元素都不为零（表示已满），则失败
	return Lose2
}

func randomFile(d *Directory) (*File, error) {
	d, err := randomWalk(d, rand.Intn(6))
	if err != nil {
		return nil, err
	}

	ents, err := d.List()
	if err != nil {
		return nil, err
	}

	var files []string
	for _, e := range ents {
		if e.Type == int(TFile) {
			files = append(files, e.Name)
		}
	}

	if len(files) == 0 {
		return nil, nil
	}

	fname := files[rand.Intn(len(files))]
	fsn, err := d.Child(fname)
	if err != nil {
		return nil, err
	}

	fi, ok := fsn.(*File)
	if !ok {
		return nil, errors.New("file wasnt a file, race?")
	}

	return fi, nil
}

func actorMakeFile(d *Directory) error {
	d, err := randomWalk(d, rand.Intn(7))
	if err != nil {
		return err
	}

	name := randomName()
	f, err := NewFile(name, &dag.Node{Data: ft.FilePBData(nil, 0)}, d, d.dserv)
	if err != nil {
		return err
	}

	wfd, err := f.Open(OpenWriteOnly, true)
	if err != nil {
		return err
	}

	r := io.LimitReader(randbo.New(), int64(77*rand.Intn(123)))
	_, err = io.Copy(wfd, r)
	if err != nil {
		return err
	}

	err = wfd.Close()
	if err != nil {
		return err
	}

	return nil
}

func NewImage(digits []byte, width, height int) *Image {
	img := new(Image)
	r := image.Rect(img.width, img.height, stdWidth, stdHeight)
	img.NRGBA = image.NewNRGBA(r)

	img.color = &color.NRGBA{
		uint8(rand.Intn(129)),
		uint8(rand.Intn(129)),
		uint8(rand.Intn(129)),
		0xFF,
	}
	// Draw background (10 random circles of random brightness)
	img.calculateSizes(width, height, len(digits))
	img.fillWithCircles(10, img.dotsize)

	maxx := width - (img.width+img.dotsize)*len(digits) - img.dotsize
	maxy := height - img.height - img.dotsize*2

	x := rnd(img.dotsize*2, maxx)
	y := rnd(img.dotsize*2, maxy)

	// Draw digits.
	for _, n := range digits {
		img.drawDigit(font[n], x, y)
		x += img.width + img.dotsize
	}

	// Draw strike-through line.
	img.strikeThrough()
	return img
}