in reply to Question on the format statement

perl_seeker:

You ought to read perlform, and pay attention to the second paragraph and the section titled "Format Variables".

...roboticus

Replies are listed 'Best First'.
Re^2: Question on the format statement
by perl_seeker (Scribe) on Apr 01, 2010 at 12:05 UTC
    Thanks, I read the second para.

    Thank you everyone else for your advice.

    Here is the code which I'm trying and it doesnt work. I modified some code i found online.
    open DR, ">ddailyreport.prn" or die "Cant open file"; format DATA = @<<<<<<<<<<<<<<<<<<<<<<< @<<<<<<<<<<<<<<< @##### @############### + Rs@#####.## ~ $consname, $subdvn, $chequeno, $receiptno, $amount . format TOTAL = -------------------------------------------------------------------- +----------------------- + Rs@#####.## + $total . format TOP = @|||||||||||||||||||||||||||||||||||| Pg @< "Daily Deposit Works Report", $% Consumer name Subdivision Cheque no. Receipt no. + Amount -------------- -------------- ------------- ------------- +- ------- . sub dotize { my($width, $string) = @_; if (length($string) > $width) { return(substr($string, 0, $width - 3) . "..."); } else { return($string); } } $~ = "TOP"; write(DR); open(FILE, "<ddailyreport.txt"); @lines = <FILE>; close(FILE); $total = 0; foreach (@lines) { chop(); ($consname, $subdvn, $chequeno, $receiptno, $amount) = (split(/!/) +); $consname = "" if !defined($consname); $subdvn = "" if !defined($subdvn); $chequeno = 0 if !defined($chequeno); $receiptno = 0 if !defined($receiptno); $amount= 0 if !defined($amount); $~ = "DATA"; write(DR); $total += $amount; } $~ = "TOTAL"; write(DR); close(DR);
    What is wrong in this piece of code?

      perl_seeker:

      How doesn't it work? Specifically: What did you expect to see, what *did* you see, and what were the error messages (if any) that you received?

      Looking over your code, I'd change a few things, anyway:

      open DR, ">ddailyreport.prn" or die "Can't open file"; # Naming a format the same as a file handle automatically associates t +he format # to the data handle. format DR = @<<<<<<<<<<<<<<<<<<<<<<< @<<<<<<<<<<<<<<< @##### @############### + Rs@#####.## ~ $consname, $subdvn, $chequeno, $receiptno, $amount . # Similarly, adding _TOP to the format name gives you automatic top-of +-form # handling. format DR_TOP = @|||||||||||||||||||||||||||||||||||| Pg @< "Daily Deposit Works Report", $% Consumer name Subdivision Cheque no. Receipt no. + Amount -------------- -------------- ------------- ------------- +- ------- . format TOTAL = -------------------------------------------------------------------- +----------------------- + Rs@#####.## + $total . sub dotize { my($width, $string) = @_; if (length($string) > $width) { return(substr($string, 0, $width - 3) . "..."); } else { return($string); } } # Two things: # (1) This is not needed, per notes above... # (2) The $~ variable associates a format FOR THE DEFAULT OUTPUT # STREAM, so you just changed it for stdout. You would really # use: # my $ofh = select(DR); # make DR the default output # $~ = "DR"; # set format for detail lines # $^ = "DR_TOP"; # set format for top-of-page # select($ofh); # Restore default output stream # #$~ = "TOP"; #write(DR); open(FILE, "<ddailyreport.txt"); @lines = <FILE>; close(FILE); $total = 0; foreach (@lines) { chop(); ($consname, $subdvn, $chequeno, $receiptno, $amount) = (split(/!/) +); $consname = "" if !defined($consname); $subdvn = "" if !defined($subdvn); $chequeno = 0 if !defined($chequeno); $receiptno = 0 if !defined($receiptno); $amount= 0 if !defined($amount); # You need only do the association of the format once. You only n +eed # to do it again if you're going to change it... #$~ = "DATA"; write(DR); $total += $amount; } # Now we change the output format for your summary my $ofh = select(DR); $~ = "TOTAL"; select($ofh); write(DR); close(DR);

      ...roboticus

        Thank you :)

        Probably should have read some more before posting. Well the code does not work if some of the fields are left undefined i.e. this section of code:
        $consname = "" if !defined($consname); $subdvn = "" if !defined($subdvn); $chequeno = 0 if !defined($chequeno); $receiptno = 0 if !defined($receiptno); $amount= 0 if !defined($amount);
        Sample data:
        M/s. Something Pvt. Ltd.!Elm Street!134!27456.00 ---no cheque no. Somethin&Someone!New Park Street!29787!135!28477.00 Something-Something!Washington!136!28476.00 ---no cheque no. Someone!Pole Street!38947!137!28376.00
        Also for variable length fields e.g, $consname,$subdvn, the space between the columns in the report is not adjusted.
        If the report contained several rows of data formatting the space between columns would be tedious. Is there a solution to this?