linux/windows/Mac平台生成随机数的不同方法

linux平台，使用rand.Seed()

//rand_linux.go
package main

import (
	"math/rand"
	"time"
)

//get the random number in [min, max]
func RandInt64(min, max int64) int64 {
	if min >= max || max == 0 {
		return max
	}
	rand.Seed(time.Now().UnixNano())
	//fmt.Println(r.Int63n(max-min) + min)
	x := rand.Int63n(max-min) + min
	//fmt.Println(x)
	return x
}

//get the random numer in [min, max]
func RandInt(min, max int) int {
	if min >= max || max == 0 {
		return max
	}
	rand.Seed(time.Now().UnixNano())

	//x := r.Intn(max-min) + min
	x := rand.Intn(max - min) + min

	//fmt.Println("RandInt: = ",x)
	return x
}

　　windows平台，直接使用 rand.Int63n() 或者 rand.Intn()

//rand_windows.go
package main

import (
	"math/rand"
)

//get the random number in [min, max]
func RandInt64(min, max int64) int64 {
	if min >= max || max == 0 {
		return max
	}
	x := rand.Int63n(max-min) + min
	//fmt.Println(x)
	return x
}

//get the random numer in [min, max]
func RandInt(min, max int) int {
	if min >= max || max == 0 {
		return max
	}

	x := rand.Intn(max - min) + min

	//fmt.Println("RandInt: = ",x)
	return x
}

　　Mac平台

//rand_darwin.go

package main
import (
    "math/rand"
    "time"
)

//RandInt64 get the random number in [min, max]
func RandInt64(min, max int64) int64 {
    if min >= max || max ==  {
        return max
    }
    rand.Seed(time.Now().UnixNano())
    //fmt.Println(r.Int63n(max-min) + min)
    x := rand.Int63n(max-min) + min
    //fmt.Println(x)
    return x
}

//RandInt get the random numer in [min, max]
func RandInt(min, max int) int {
    if min >= max || max ==  {
        return max
    }
    rand.Seed(time.Now().UnixNano())

    //x := r.Intn(max-min) + min
    x := rand.Intn(max-min) + min

    //fmt.Println("RandInt: = ",x)
    return x
}