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array5.go
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array5.go
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//++++++++++++++++++++++++++++++++++++++++
// 《Go语言高级开发与实战》源码
//++++++++++++++++++++++++++++++++++++++++
// Author:廖显东(ShirDon)
// Blog:https://www.shirdon.com/
// 公众号:源码大数据
// 仓库地址:https://gitee.com/shirdonl/goAdvanced
// 仓库地址:https://github.com/shirdonl/goAdvanced
//++++++++++++++++++++++++++++++++++++++++
package main
import (
"errors"
"fmt"
"math/rand"
"time"
)
func init() {
rand.Seed(time.Now().Unix())
}
func main() {
str := []string{
"0", "1", "2", "3", "4", "5", "6",
}
a, _ := RandomInt(str, 5)
fmt.Println(a)
}
//Fisher-Yates随机置乱算法生成随机整数
func RandomInt(strings []string, length int) (string, error) {
if len(strings) <= 0 {
return "", errors.New("字符串长度不能小于 0")
}
if length <= 0 || len(strings) <= length {
return "", errors.New("参数长度非法")
}
for i := len(strings) - 1; i > 0; i-- {
num := rand.Intn(i + 1)
strings[i], strings[num] = strings[num], strings[i]
}
str := ""
for i := 0; i < length; i++ {
str += strings[i]
}
return str, nil
}