golang之math/rand随机数

package main
import (
    "fmt"
    "math/rand"
    "time"
)
func init(){
    //以时间作为初始化种子
    rand.Seed(time.Now().UnixNano())
}
func main() {

    for i := 0; i < 10; i++ {
        a := rand.Int()
        fmt.Println(a)
    }
    for i := 0; i < 10; i++ {
        a := rand.Intn(100)
        fmt.Println(a)
    }
    for i := 0; i < 10; i++ {
        a := rand.Float32()
        fmt.Println(a)
    }

}