Quine like self-rewriting program in perl
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| eval($code=q{ | |
| # Quine like self-rewriting program | |
| # 1st : $ perl quine.pl > a1.pl | |
| # repeat : $ perl a1.pl > a2.pl ; cat a2.pl ; cp a2.pl a1.pl | |
| $str=" | |
| XXXXXXXXXX | |
| A | |
| XXXXXXXXXX | |
| "; | |
| @arr = split('XXXXXXXXXX',$code); | |
| if($arr[1] =~ /\sA\s$/){$arr[1] = "\nAp\n"} | |
| elsif($arr[1] =~ /\sAp\s$/){$arr[1] = "\nApr\n"} | |
| elsif($arr[1] =~ /\sApr\s$/){$arr[1] = "\nApri\n"} | |
| elsif($arr[1] =~ /\sApri\s$/){$arr[1] = "\nApril\n"} | |
| elsif($arr[1] =~ /\sApril\s$/){$arr[1] = "\nApril_\n"} | |
| elsif($arr[1] =~ /\sApril_\s$/){$arr[1] = "\nApril_F\n"} | |
| elsif($arr[1] =~ /\sApril_F\s$/){$arr[1] = "\nApril_Fo\n"} | |
| elsif($arr[1] =~ /\sApril_Fo\s$/){$arr[1] = "\nApril_Foo\n"} | |
| elsif($arr[1] =~ /\sApril_Foo\s$/){$arr[1] = "\nApril_Fool\n"} | |
| $code = join('XXXXXXXXXX',@arr); | |
| print"eval(\$code=q{$code})\n" | |
| }) |
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