douketangyouzh5219
2017-05-17 13:50 阅读 421
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如何在Golang中随机播放数组中的字符串?

So I created a program to help me decide which game to play. Before I start my problem let me show you my code:

package main

import (
    "fmt"
    "strconv"
    "time"
)

func main() {
    isArray := [10]string{"Paladins", "Overwatch", "CS:GO", "Tanki", "Left 4 Dead", "Rocket League", "Call Of Duty : AW", "Portal", "Star Citizen", "Star Wars : Battlefront"}
    fmt.Print("0,1,2,3,4,5,6,7,8,9 := ")

    var (
        va string
        ar string
    )

    fmt.Scanln(&va)
    i, _ := strconv.Atoi(va)

    fmt.Print("You Should Play : ")
    fmt.Print(isArray[i], "
")
    fmt.Print("[Y/N] := ")
    fmt.Scanln(&ar)

    if ar != "N" || ar != "n" {
        fmt.Print("OK")
    }

    time.Sleep(3 * time.Second)
}

So the problems start when I already know which number would trigger a game, if I use it twice. So I am trying to make the strings random, like shuffling each time I use it, how can I do that?

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3条回答 默认 最新

  • 已采纳
    doufei1852 doufei1852 2017-05-17 14:31

    Well, literally for your problem why not use rand.Intn() to choose a random number and print the game rather than make the user pick a number?

    isArray := [10]string{"Paladins", "Overwatch", "CS:GO", "Tanki", "Left 4 Dead", "Rocket League", "Call Of Duty : AW", "Portal", "Star Citizen", "Star Wars : Battlefront"}
    n := rand.Intn(9)
    fmt.Printf("You Should Play : %s
    ", isArray[n])
    

    But if you want to shuffle strings in an array for the sake of it, then you can do it in place like this:

    // Shuffle array in place
    l := len(isArray)-1
    for i := 0; i <=l; i++ {
        n := rand.Intn(l)
        // swap
        x := isArray[i]
        isArray[i] = isArray[n]
        isArray[n] = x
    }
    

    This should be O(n), though I'm not sure about the complexity of Intn. If you really want to be fancy, you could:

    1. Create a second array (randomArray) of touples, containing a random number and element position in isArray.
    2. Sort this array by the random number
    3. Create a new array, copying elements of isArray, but ordered by our randomArray
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  • dongxiangxie8181 dongxiangxie8181 2017-09-08 10:24
     package main
    
     import (
             "fmt"
             "math/rand"
             "time"
     )
    
     func shuffle(src []string) []string {
             final := make([]string, len(src))
             rand.Seed(time.Now().UTC().UnixNano())
             perm := rand.Perm(len(src))
    
             for i, v := range perm {
                     final[v] = src[i]
             }
             return final
     }
    
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  • duanpi5733 duanpi5733 2018-12-09 18:53
    package main
    
    import (
        "fmt"
        "math/rand"
        "time"
    )
    
    type list []string
    
    func main() {
    
        s := list{
            "Tanki",
            "Left 4 Dead",
            "Rocket League",
            "Call Of Duty : AW",
        }
        s.shuffle()
        s.print()
    }
    
    func (l list) print() {
        for i, v := range l {
            fmt.Println(i, v)
        }
    }
    
    func (l list) shuffle() list {
        src := rand.NewSource(time.Now().UnixNano())
        r := rand.New(src)
        for i := range l {
            n := r.Intn(len(l) - 1)
            l[i], l[n] = l[n], l[i]
        }
        return l
    }
    
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