package main

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

func main() {
	//var i1 int
	//i1 = 9223372036854775807
	//fmt.Printf("%T, %d\n", i1, i1)
	//var i2 int8
	//i2 = 127
	//fmt.Printf("%T, %d\n", i2, i2)
	// 生成大整数
	max := new(big.Int).Lsh(big.NewInt(1), 128)
	fmt.Println(max)
	// 生成大整数随机数
	serialNumber, _ := rand.Int(rand.Reader, max)
	fmt.Println(serialNumber)
}