GO 编程语言中的标准 unicode

Question

我有一个字符串，其中包含通过 unicode 从红桃 A 到红桃 10 的卡片（该练习需要使用字符串，因此没有数组或切片）给定一个数字 n，我必须从该字符串中提取 n 张卡片。如果使用 for-range 我得到的位数比我需要的少，我该怎么做？package mainimport (    "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}

Answer 1

您的人口函数有一个错误：

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

Answer 2

需要的人的正确代码：

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

}