2-21 复合类型综合练习

package main

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

var names []string

func main() {
    Addstudent("张三丰", "老四", "王老五", "东邪", "西毒", "白景琦", "臭老九", "王石")
    fmt.Println(names)
    scoreMap := TakeExam(names...)
    fmt.Println(scoreMap)
    showRanking(scoreMap)
}

func Addstudent(AddComers ...string) {
    names = append(names, AddComers...)
}

func TakeExam(name... string)(scoreMap map[string]int) {
    scoreMap = make(map[string]int)
    for _, name := range names{
        randint := Randint(100)
        scoreMap[name] = randint
    }
    return
}

//对map里面的人进行排序
func showRanking(scoreMap map[string]int)  {
    names := make([]string, 0)
    for name ,_ :=range scoreMap{
        names = append(names, name)
    }


    for i := 0; i < len(names)-1; i++ {
        for j := i+1;j <= len(names) ;j++  {
            if scoreMap[names[j]] > scoreMap[names[i]]{
                names[i],names[j] = names[j],names[i]
            }
        }
    }

    for index, name :=range names{
        fmt.Printf("第%d名:%-6s \t %-3d\n",index+1,names[index],scoreMap[name])
    }
}

func Randint(n int) int {
    time.Sleep(time.Nanosecond)
    r := rand.New(rand.NewSource(time.Now().UnixNano()))
    return r.Intn(n + 1)
}