go-generate-number-crypto.go

package main

import (
	"fmt"
	"crypto/rand"
	"math/big"
)

func Int64() (s int64, err error) {
	bi := big.NewInt(9223372036854775807)
	r, err := rand.Int(rand.Reader, bi)
	if err != nil {
	  return
	}
	s = r.Int64()
	return
}

func main() {
  for i := 0; i < 10; i++ {
    i, err := Int64()
    fmt.Println(i, err)
  }
}

go-generate-number-rand.go

package main

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

func main() {
  rand.Seed(time.Now().UTC().UnixNano())
  for i := 0; i < 10; i++ {
      fmt.Println(rand.Uint64())    
  }
}