例如輸入全小寫abc,則能夠生成abc,Abc,aBc,ABc,abC,AbC,aBC,ABC:
#!/usr/bin/perl -w
$abc='abc';
while($abc){
print $abc.$/;
$abc = jia1($abc);
}
sub jia1{
my ($words) = (@_);
if($words =~ /^[A-Z]+$/){return 0}
my @words_array = split('',$words);
my $jinwei = 1;
foreach (@words_array){
if($jinwei == 1) {
if($_ =~ /^[a-z]$/){
$_ = uc $_;
$jinwei = 0;
}elsif($_ =~ /^[A-Z]$/){
$_ = lc $_;
$jinwei = 1;
}
}
}
$words = join('',@words_array);
return $words;
}