#!usr/bin/perl

# The program calculates the total zeros and positive integers from 
# the data using regex

use strict;
use warnings;
my ( $c_positive_int, $c_negative_int, $c_zero_int, $ctr_not_int) = ( 0, 0, 0, 0 );

while( my $num = <DATA> ) 
{
        $num =~ s/^\s+//;  # delete leading space(s)
        $num =~ s/\s+$//;  # delete trailing space(s)
        
        if ( $num =~ /^0$/ )      # integer single 0
        {
                $c_zero_int++;
        }
        elsif ( $num =~ /^\d+$/ ) # only positive digits
        {
                $c_positive_int++;
        }
        elsif ( $num =~ /^-\d+$/ ) #leading minus sign, then only digits 
        {
                $c_negative_int++;
        }
        else
        {
            $ctr_not_int++;    #non integer 
            print "**** Error $num is not an integer!\n";
        }
}
printf "freq(Z+):%8i\n", $c_positive_int;
printf "freq(Z-):%8i\n", $c_negative_int;
printf "freq(0): %8i\n", $c_zero_int;
printf "freq(?): %8i\n", $ctr_not_int;
printf "Total:   %8i\n", $c_positive_int + $c_negative_int + 
                         $c_zero_int + $ctr_not_int ;

=Results
**** Error 32.5 is not an integer!
freq(Z+):       7
freq(Z-):       3
freq(0):        1
freq(?):        1
Total:         12

=cut

__DATA__
19
-22
498
512
15
-932
0
22
808
17
-32 
32.5