做题：数字黑洞一例(523066680版主出的)

sxw

批版的601997526 已经写出来了，俺写个Perl版的：

1. 
   
2. #!/usr/bin/perl
   
3. use strict;
   
4. use warnings;
   
5. 
   
6. while (1) {
   
7. print "Type a number between 1000-9999:";
   
8. chomp (my $num=<STDIN>);
   
9. redo if $num !~ /^\d\d\d\d$/;
   
10. redo if $num =~ /^(\d)\1\1\1$/;
    
11. 
    
12. until ($num==6174) {
    
13.         my @big_to_small=sort {$b <=> $a } split //,$num;
    
14.         my @small_to_big=reverse @big_to_small;
    
15.         my $left=join "",@big_to_small;
    
16.         my $right=join "",@small_to_big;
    
17.         $num=scalar($left-$right);
    
18.         print "$left-$right=","$num\n";
    
19. }
    
20. print "-" x 15,"\n";
    
21. }
    

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523066680

前来支持~

sxw

回复 2# 523066680


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