in reply to returning to a loop later on

Fix: 

#!/usr/bin/perl

use strict;
use warnings;

my $output = "data";

my $out;
for (;;) {
    print("Do you want to output to (S)creen or to (F)ile? ");
    chomp( $out = uc( <STDIN> ) );
    last if $out eq 'S' or $out eq 'F';
    print("Invalid input. Please type either S or F.\n");
}

if ($out eq 'S') {
    print $output;
}
else  # $out eq 'F'
{
    for (;;) {
        print("Please enter filename: ");
        chomp( my $save = <STDIN> );

        if ( $save !~ /^[a-zA-Z][a-zA-Z_0-9]*\Z/ ) {
            print("Invalid input. Please begin with a letter and do no
+t add extension, it will be added automatically.\n");
            redo;
        }

        $save .= ".ext";  # XXX TODO

        if ( -e $save ) {
            my $overwrite;
            for (;;) {
                print("Filename exists. Overwrite? (Y) or (N) ");
                chomp( $overwrite = uc( <STDIN> ) );
                last if $overwrite eq 'Y' or $overwrite eq 'N';
                print("Invalid input. Please type either Y or N.\n")
            }

            redo if $overwrite eq 'N';
        }

        open( my $fh_out, '>', $save )
           or die "Unable to create $save: $!\n";

        print $fh_out $output;

        last;
    }
}

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Update: Added the the last last. I knew I needed it!

Update: Fixed the issues raised in replies to this node.

Replies are listed 'Best First'.
Re^2: returning to a loop later on
by Yoda_Oz (Sexton) on Sep 07, 2006 at 08:06 UTC
    i get the error: "syntax error at output.pl line 3, at EOF Execution of output.pl aborted due to compilation errors." when i run the code above. any ideas why? also, for some reason warning isnt in my distribution of perl. if i include use warning it comes up with the error: "Can't locate warning.pm in @INC (@INC contains: /System/Library/Perl/5.8.6/darwin-thread-multi-2level /System/Library/Perl/5.8.6 /Library/Perl/5.8.6/darwin-thread-multi-2level /Library/Perl/5.8.6 /Library/Perl /Network/Library/Perl/5.8.6/darwin-thread-multi-2level /Network/Library/Perl/5.8.6 /Network/Library/Perl /System/Library/Perl/Extras/5.8.6/darwin-thread-multi-2level /System/Library/Perl/Extras/5.8.6 /Library/Perl/5.8.1/darwin-thread-multi-2level /Library/Perl/5.8.1 .) at output.pl line 3. BEGIN failed--compilation aborted at output.pl line 3." thanks for the help!
[reply]

      It's a typo in ikegami's code. Change line 3 to:

      use warnings;
[reply]
[d/l]
        haha, yeah! didnt even notice!
        anyway, the code still doesnt work. i just get an error saying that: 
        syntax error at output.pl line 2, at EOF
Execution of output.pl aborted due to compilation errors.

        [download]
        this is the exact code that im running: 
        #!usr/local/bin/perl
use strict;
use warnings;

my $output = "data";

my $out;
for (;;) {
    print("Do you want to output to (S)creen or to (F)ile? ");
    chomp( $out = uc( <STDIN> ) );
    last if $out eq 'S' or $out eq 'F';
    print("Invalid input. Please type either S or F.\n");
}

if ($out eq 'S') {
    print $output;
}
else  # $out eq 'F'
{
    for (;;) {
        print("Please enter filename: ");
        chomp( my $save = <STDIN> );

        if ( $save !~ /^[a-zA-Z][a-zA-Z_0-9]*\Z/ ) {
            print("Invalid input. Please begin with a letter and do no
+t add extension, it will be added automatically.\n");
            redo;
        }

        $save .= ".ext";

        if ( -e $save ) {
            my $overwrite;
            for (;;) {
                print("Filename exists. Overwrite? (Y) or (N) ");
                chomp( $overwrite = uc( <STDIN> ) );
                last if $out eq 'Y' or $out eq 'N';
                print("Invalid input. Please type either Y or N.\n")
            }


            redo if $overwrite eq 'N';
        }

        open( my $fh_out, '>', $save )
           or die "Unable to create $save: $!\n";

        print $fh_out $output;

        last;
    }
}

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