How many ways are there to generate random numbers in golang?

There are many ways to generate random numbers. Here is a summary, so you can choose the appropriate one.

Method 1: Set the seed to generate a random number between 0-30000

func main(){
    rand.Seed(time.Now().UnixNano())
    num := rand.Intn(30000)
    fmt.Println(num)
}

Method 2: Generate a random number in the specified interval

func RandInt(min, max int) int {
  if min >= max || min == 0 || max == 0 {
    return max
  }
  return rand.Intn(max-min) + min
}
 
//调用
func main(){
    num := RandInt(3,200)
    fmt.Println(num)
}

Method 3: Similar to Method 1

func main(){
    r := rand.New(rand.NewSource(time.Now().UnixNano()))
    n := r.Intn(3000)
    fmt.Println(n)
}

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