douketangyouzh5219 2017-05-17 13:50
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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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  • doufei1852 2017-05-17 14:31
    关注

    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
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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