编写shell函数 实现剪刀石头布 有几种方法

以下是几种使用 Shell 函数实现剪刀石头布游戏的方法：

方法一：使用 if-elif-else 语句实现

#!/bin/bash

function play_game {
    options=("剪刀" "石头" "布")
    random_index=$((RANDOM % 3))
    computer_choice=${options[random_index]}

    echo "欢迎来到剪刀石头布游戏！"
    echo "请出拳：剪刀、石头、布"
    read user_choice

    echo "你出了：$user_choice"
    echo "电脑出了：$computer_choice"

    if [ "$user_choice" == "$computer_choice" ]; then
        echo "平局！"
    elif [ "$user_choice" == "剪刀" ] && [ "$computer_choice" == "布" ]; then
        echo "你赢了！"
    elif [ "$user_choice" == "石头" ] && [ "$computer_choice" == "剪刀" ]; then
        echo "你赢了！"
    elif [ "$user_choice" == "布" ] && [ "$computer_choice" == "石头" ]; then
        echo "你赢了！"
    else
        echo "你输了！"
    fi
}

play_game

方法二：使用 case 语句实现

#!/bin/bash

function play_game {
    options=("剪刀" "石头" "布")
    random_index=$((RANDOM % 3))
    computer_choice=${options[random_index]}

    echo "欢迎来到剪刀石头布游戏！"
    echo "请出拳：剪刀、石头、布"
    read user_choice

    echo "你出了：$user_choice"
    echo "电脑出了：$computer_choice"

    case "$user_choice $computer_choice" in
        "剪刀 布" | "石头 剪刀" | "布 石头")
            echo "你赢了！"
            ;;
        "剪刀 石头" | "石头 布" | "布 剪刀")
            echo "你输了！"
            ;;
        *)
            echo "平局！"
            ;;
    esac
}

play_game

方法三：使用数组和循环实现

#!/bin/bash

function play_game {
    options=("剪刀" "石头" "布")
    random_index=$((RANDOM % 3))
    computer_choice=${options[random_index]}

    echo "欢迎来到剪刀石头布游戏！"
    echo "请出拳：剪刀、石头、布"
    read user_choice

    echo "你出了：$user_choice"
    echo "电脑出了：$computer_choice"

    for i in "${!options[@]}"; do
        if [ "${options[$i]}" == "$user_choice" ]; then
            user_index=$i
        fi
        if [ "${options[$i]}" == "$computer_choice" ]; then
            computer_index=$i
        fi
    done

    diff=$(($user_index - $computer_index))

    if [ "$diff" == "0" ]; then
        echo "平局！"
    elif [ "$diff" == "-1" ] || [ "$diff" == "2" ]; then
        echo "你赢了！"
    else
        echo "你输了！"
    fi
}

play_game

注意，以上三种方法都是基于 Bash Shell 实现的，可在 Linux 和 macOS 等系统中运行。