GO編程語言中的標準unicode

我有一個字串，通過 unicode 包含從紅心 A 到 10 紅心的卡片（練習需要使用字串，所以沒有陣列或切片）給定一個數字 n，我必須從這個字串中提取 n 張卡片。如果使用 for-range 得到的位比我需要的少，我該怎么做？

package main

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

func main() {
    var n int
    var deck string

    rand.Seed(int64(time.Now().Nanosecond()))

    n = readNumber()
    deck = deckGenerator()
    drawCards(deck, n)

}

func readNumber() (n int) {
    for n <= 0 || n >= 10 {
        fmt.Print("Enter number between 1 and 9: ")
        fmt.Scan(&n)
    }
    return n
}

func deckGenerator() (deck string) {
    for i := 0; i < 10; i   {
        deck  = strconv.Itoa('\U0001F0B1'   i)
    }
    return deck
}

func drawCards(deck string, n int) {
    for i := 0; i < n; i   {
        cardPulledOut, deck2 := drawCard(deck)
        fmt.Println("Pulled out the card", cardPulledOut, "- Cards left in the deck:", deck2)
    }
}

func drawCard(deck string) (cardPulledOut rune, deck2 string) {
    for true {
        card := rune(('\U0001F0B1')   rand.Intn(10)) //random number between 0 and 9 inclusive

        for _, v := range deck {
            fmt.Println(v, card)
            /*
                output: (infinity loop)
                ...
                49 127156
                53 127156
                56 127156
                ...
            */
            if v == card {
                deck = strings.Replace(deck, string(card), "", 1)
                return cardPulledOut, deck2
            }
        }
    }
    return
}

uj5u.com熱心網友回復：

您的人口功能有一個錯誤：

func deckGenerator() (deck string) {
    for i := 0; i < 10; i   {
        // deck  = strconv.Itoa('\U0001F0B1'   i) // converts integers to their string equivalent e.g. "127156"

        deck  = string(rune('\U0001F0B1'   i))    // fix
    }
    return deck
}

https://go.dev/play/p/E3sVRZK4exh

uj5u.com熱心網友回復：

需要的人的正確代碼：

package main

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

func main() {
    var n int
    var deck string

    rand.Seed(int64(time.Now().Nanosecond()))

    n = readNumber()
    deck = deckGenerator()
    drawCards(deck, n)

}

func readNumber() (n int) {
    for n <= 0 || n >= 10 {
        fmt.Print("Enter number between 1 and 9: ")
        fmt.Scan(&n)
    }
    return n
}

func deckGenerator() (deck string) {
    for i := 0; i < 10; i   {
        //deck  = strconv.Itoa('\U0001F0B1'   i)
        deck  = string(rune('\U0001F0B1'   i))
    }
    return deck
}

func drawCards(deck string, n int) {
    var cardPulledOut rune
    for i := 0; i < n; i   {
        cardPulledOut, deck = drawCard(deck)
        fmt.Println("Pulled out the card", string(rune(cardPulledOut)), "- Cards left in the deck:", deck)
    }
}

func drawCard(deck string) (card rune, deck2 string) {
    for true {
        card = rune(('\U0001F0B1')   rand.Intn(10)) //random number between 0 and 9 inclusive

        for _, v := range deck {
            //fmt.Println(v, card)
            if v == card {
                deck2 = strings.Replace(deck, string(card), "", 1)
                return card, deck2
            }
        }
    }
    return
}

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