Perl版猜数字游戏

#!/usr/bin/perl

use Getopt::Std;

@orig_num;
@guess_num;

sub show_usage() {
        print "Usage: $0 ";
        print "         -h Show this help message ";
        print "         -r Show rules of the game ";
        print "         -p play game ";
        exit 0;
}

sub show_rules() {
        print "Welcome to This GUESS NUMBER GAME~! ";
        print "There is a integer which contains  four digits. And each digit of the integer is different from each other. ";
        print "You have 8 chances to guess the integer. ";
        print "I will show you how many right numbers having right digits with [0-9]A and how many numbers you guess are right but the digits you put are wrong with [0-9]B ";
}

sub generate_rand() {
        my $i = 0;
        my $j = 0;
        my $seed=time();
        srand($seed);
        while($i<4) {
                my $rand = int(rand(9));
                if(($i == 0) && ($rand == 0)) {
                        next;
                }
                for($j = 0; $j < $i; $j++) {
                        if($rand == $orig_num[$j]) {
                                $rand = 11;
                                last;
                        }
                }
                if($rand < 10) {
                        $orig_num[$i] = $rand;
                        $i ++;
                }
        }
#       print @orig_num," ";
}

sub get_guess_number() {
        my $num_tmp;
        print "Please input the number you guessed: ";
        read(STDIN,$num_tmp,4);
        ;
        chomp($num_tmp);
        return $num_tmp;
        print " ";
}

sub check_res() {
        my $i, $j;
        my $a = 0, $b = 0;
        for($i = 0; $i < 4; $i ++) {
                for($j = 0; $j < 4; $j ++) {
                        if($orig_num[$i] == $guess_num[$j]) {
                                if($i == $j) {
                                        $a++;
                                }
                                else {
                                        $b++;
                                }
                        }
                }
        }
        if($a != 4) {
                return "[$a]A[$b]B";
        }
}

sub play_game() {
        generate_rand();
        my $i = 0;
        my $num_guess_tmp;
        while($i < 8) {
                $num_guess_tmp = get_guess_number();
                @guess_num = split(//,$num_guess_tmp);
                $result=check_res();
                if("$result" eq "") {
                        print "Congratulations! You win!~~~~~~~  ^_^ ";
                        exit 0;
                }
                else {
                        print "The result is: $result "
                }
                $i ++;
        }
        if($i == 8)
        {
                print "I am sorry you lose. The number is @orig_num. ";
                exit 0;
        }
}

sub get_opts() {
        getopts(''hrp'');
        if(defined($opt_p)) {
                play_game();
        }
        elsif((not defined($opt_h))&&(not defined($opt_r))) {
                show_usage();
        }
        elsif(defined($opt_r)) {
                show_rules();
        }
        if(defined($opt_h)) {
                show_usage();
        }

}

get_opts();