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#include <stdio.h>
#include <stdlib.h>
...
           there are either no digits or non-digits
   case c) a null string results in 0
*/

#!/usr/bin/perl -w
use strict;
...
my $a = "23B";
$a +=0;
print $a;

my $x = "00012";
print "$x\n";
...
##prints
#00012
#12