Shell脚本实现的猜数字小游戏

生成的密码和用户输入可以接受重复数字。
所以相对一般规则的猜数字可能难度要大不少。

本版本规则：

a--数字对，位置也对
b--排除a的结果后，数字对，但位置不对

开始后，系统化初始化一个4位可重复数字，如“1223”。假设用户第一次输入“1234”，那么系统将提示“2a1b”，前两位数字“12”相同并且位置也相同，为“2a”。后两位数字中，用户输入的“3”与密文中“3”相同，但两者位置不同，则为“1b”，最终结果为“2a1b”。

再假设用户此时输入“1232”，那么结果则为“2a2b”，计算方法与前次一样。

代码如下：

#!/bin/bash
clear
echo
echo "###################################################################"
echo "# this is a bash-shell game write by email:[e-mail] #"
echo "# the game called *digits*,and this version have repeated numbers #"
echo "#              version 1.0              #"
echo "###################################################################"
echo -e "\n\n"
declare input
declare password
declare a
declare b
declare x
declare y
declare loop
#this funtion init the variable password that user need to guess
init_password()
{
    password=`echo $(($random%10000))`
    echo $password | grep '^[0-9]\{4\}$' >/dev/null 2>&1
    if [ $? != 0 ]
    then
        init_password
    else
        input
    fi
}
#this funtion accept the input from user's keyboard
input()
{
    echo -n "please input a number between 0000-9999:"
    read input
    echo $input | grep '^[0-9]\{4\}$' >/dev/null 2>&1
    if [ $? != 0 ]
    then
        echo "retry a number between 0000-9999 and do not input a char"
        input
    else
        judge
    fi
}
#this funtion is the main funtion
judge()
{
    x=$input
    y=$password
    while [ $input != $password ]
    do
        a=0
        b=0
        judge_a
        judge_b
        loop=`expr $loop + 1`
        echo "****************************"
        echo "*      "$a"a"$b"b      *"
        echo "****************************"
        input
    done
}
#this funtion count the variable a's value
judge_a()
{
        for i in `seq 4`
        do
            var_input=`expr substr "$x" $i 1`
            for j in `seq 4`
            do
                var_password=`expr substr "$y" $j 1`
                if [[ $var_input = $var_password && $var_input != "" && $var_password != "" && $i = $j ]]
                then
                    a=`expr $a + 1`
                    x=`expr substr $x 1 "$[$i-1]"``expr substr $x "$[$i+1]" 4`
                    y=`expr substr $y 1 "$[$i-1]"``expr substr $y "$[$i+1]" 4`
                    judge_a
                fi
            done
        done
}
#this funtion count the variable b's value
judge_b()
{
        for i in `seq 4`
        do
            var_input=`expr substr "$x" $i 1`
            for j in `seq 4`
            do
                var_password=`expr substr "$y" $j 1`
                if [[ $var_input = $var_password && $var_input != "" && $var_password != "" ]]
                then
                    b=`expr $b + 1`
                    x=`expr substr "$x" 1 "$[$i-1]"``expr substr "$x" "$[$i+1]" 4`
                    y=`expr substr "$y" 1 "$[$j-1]"``expr substr "$y" "$[$j+1]" 4`
                    judge_b
                fi
            done
        done
}
#this is the begin of script
loop=1
init_password
echo "#############################################"
echo "#congratulations!you have tried $loop times!  #"
echo "#    the password is $password !       #"
echo "#############################################"