Mariana aņez wrote:
>
> I wrote this two scripts (to do "./mynum | ./mycount" on linux shell):
>
> mynum:
>
> #*******************************************************************
> # Write a number from 1 to oo
> #******************************************************************
>
> #!/usr/bin/perl
Because standard input and output are buffered you have to add this line
to get the results you want:
$| = 1;
> my $i=1;
> while ($i>0){
> print "$i\n";
> sleep 5;
> $i++;
> }
>
> mycount:
>
> #***********************************************************************
> ****# Read from standard input (STDIN) a number pulsing it with before
> number
> # and each 10 seconds print the result value on the screen
> #***********************************************************************
> ****
>
> #!/usr/bin/perl
>
> my $sum=0;
> my $first;
my $first = 0;
If you don't initialize $first you will get a warning when you compare
it to zero in your if statement.
> my $count;
> my $last;
>
> local $SIG{'ALRM'}=\&on_count;
>
> alarm 10;
>
> while ( <STDIN> ) {
> my $num = <STDIN>;
You are reading every _second_ line from STDIN. Is that really what you
want?
> chop $num;
> next if(!($num=~m/(^([0-9]+)$)/));
> $sum=$sum+$num;
> }
while ( <> ) {
# if you really only want every second line then uncomment the next line
# next if $. % 2;
chomp;
next unless /^\d+$/;
$sum += $_;
}
> sub on_count{
> if ($first==0)
> {
> $first=1;
> $last=$sum;
> print "NAN:$sum\n";
> }
> else{
>
> $count=$sum-$last;
> $last=$sum;
> print "Contador=$count\n";
> }
>
> alarm 10;
>
> }
John
--
use Perl;
program
fulfillment
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