double quotes are needed
Can someone tell me why I need double quotes for this to work at the line with: print $first, $second, $third\n; #!/usr/bin/perl -w $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; $answer = $first + $second + $third; print $answer\n; It only gives this output when I write double quotes print $first, $second, $third\n; 255, 255, 255 765 Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502
Re: double quotes are needed
Hi Mike! On Wednesday 06 Jan 2010 19:27:59 Grove, Michael wrote: Can someone tell me why I need double quotes for this to work at the line with: print $first, $second, $third\n; #!/usr/bin/perl -w Don't use -w. Add use strict; and use warnings;. Then fix the errors. $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; $third\n is invalid code. The \n must be placed inside a string. Regards, Shlomi Fish $answer = $first + $second + $third; print $answer\n; It only gives this output when I write double quotes print $first, $second, $third\n; 255, 255, 255 765 Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Interview with Ben Collins-Sussman - http://shlom.in/sussman Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: double quotes are needed
On Wed, Jan 6, 2010 at 11:27 AM, Grove, Michael migr...@state.pa.us wrote: Can someone tell me why I need double quotes for this to work at the line with: print $first, $second, $third\n; #!/usr/bin/perl -w $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; This passes a list to the print command. It's equivalent to saying... my @list = ($first, $second, $third); print @list; $answer = $first + $second + $third; print $answer\n; It only gives this output when I write double quotes print $first, $second, $third\n; 255, 255, 255 765 print $first, $second, $third\n prints a single, scalar value. -- Robert Wohlfarth
Re: double quotes are needed
On 1/6/10 Wed Jan 6, 2010 9:27 AM, Grove, Michael migr...@state.pa.us scribbled: Can someone tell me why I need double quotes for this to work at the line with: print $first, $second, $third\n; #!/usr/bin/perl -w $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; $answer = $first + $second + $third; print $answer\n; It only gives this output when I write double quotes print $first, $second, $third\n; 255, 255, 255 765 What output do you get when you do not write double quotes? I get 'Backslash found where operator expected at ...'. Is that what you get? (It helps to let us know what you are getting from your original version). The print function prints strings. The unquoted \n is not a string - it is a syntax error. If the \n is enclosed in double quotes, it will generate a newline character. Did you really mean print $first, $second, $third\n or did you mean print $first, $second, $third\n ? The former is a standalone string and does nothing. The latter will print the results as you have shown. You should put 'use strict;' at the top of your program, and remove the '-w' and replace it with 'use warnings;'. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
RE: double quotes are needed
Thanks. Is this better? print $first, $second, $third,\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. I am only on pg 21 of Learning Perl 5th ed. I am trying as many variations of the examples just to mess around and see what happens with different characters. Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -Original Message- From: Shlomi Fish [mailto:shlo...@iglu.org.il] Sent: Wednesday, January 06, 2010 12:45 PM To: beginners@perl.org Cc: Grove, Michael Subject: Re: double quotes are needed Hi Mike! On Wednesday 06 Jan 2010 19:27:59 Grove, Michael wrote: Can someone tell me why I need double quotes for this to work at the line with: print $first, $second, $third\n; #!/usr/bin/perl -w Don't use -w. Add use strict; and use warnings;. Then fix the errors. $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; $third\n is invalid code. The \n must be placed inside a string. Regards, Shlomi Fish $answer = $first + $second + $third; print $answer\n; It only gives this output when I write double quotes print $first, $second, $third\n; 255, 255, 255 765 Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Interview with Ben Collins-Sussman - http://shlom.in/sussman Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: double quotes are needed
On Wednesday 06 Jan 2010 20:38:29 Grove, Michael wrote: Thanks. Is this better? print $first, $second, $third,\n; Yes, but you can also write it as: print $first, $second, $third\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. What do you mean by that? How are you writing it? Also, please avoid top-posting and quote my reply: http://en.wikipedia.org/wiki/Posting_style Regards, Shlomi Fish I am only on pg 21 of Learning Perl 5th ed. I am trying as many variations of the examples just to mess around and see what happens with different characters. Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Optimising Code for Speed - http://shlom.in/optimise Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: double quotes are needed
On 1/6/10 Wed Jan 6, 2010 10:38 AM, Grove, Michael migr...@state.pa.us scribbled: Thanks. Is this better? print $first, $second, $third,\n; I would just use: print $first, $second, $third\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. Not sure what you mean. Can you show us the exact line and the exact error you are getting? -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
RE: double quotes are needed
Thanks everyone. The one line I wrote was a mistake in quote placement for this message: print $first, $second, $third\n meant print $first, $second, $third, \n But I don't want the last comma in the output, so I wrote this with your help: #!/usr/bin/perl $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third,\n; $answer = $first + $second + $third; print $answer\n; or is this way preferred? #!/usr/bin/perl $first = 0xFF; $second = 0377; $third = 0b; print $first, $second, $third\n; $answer = $first + $second + $third; print $answer\n; Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -Original Message- From: Shlomi Fish [mailto:shlo...@iglu.org.il] Sent: Wednesday, January 06, 2010 1:48 PM To: beginners@perl.org Cc: Grove, Michael Subject: Re: double quotes are needed On Wednesday 06 Jan 2010 20:38:29 Grove, Michael wrote: Thanks. Is this better? print $first, $second, $third,\n; Yes, but you can also write it as: print $first, $second, $third\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. What do you mean by that? How are you writing it? Also, please avoid top-posting and quote my reply: http://en.wikipedia.org/wiki/Posting_style Regards, Shlomi Fish I am only on pg 21 of Learning Perl 5th ed. I am trying as many variations of the examples just to mess around and see what happens with different characters. Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Optimising Code for Speed - http://shlom.in/optimise Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
RE: double quotes are needed
Shlomi, what is top posting? where you said: please avoid top-posting and quote my reply Fyi I used use strict; and use warnings; And got a bunch of global errors to I put my in front of all of my variables. I have a lot to learn still. #!/usr/bin/perl use strict; use warnings; my $first = 0xFF; my $second = 0377; my $third = 0b; print $first, $second, $third\n; my $answer = $first + $second + $third; print $answer\n; Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -Original Message- From: Shlomi Fish [mailto:shlo...@iglu.org.il] Sent: Wednesday, January 06, 2010 1:48 PM To: beginners@perl.org Cc: Grove, Michael Subject: Re: double quotes are needed On Wednesday 06 Jan 2010 20:38:29 Grove, Michael wrote: Thanks. Is this better? print $first, $second, $third,\n; Yes, but you can also write it as: print $first, $second, $third\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. What do you mean by that? How are you writing it? Also, please avoid top-posting and quote my reply: http://en.wikipedia.org/wiki/Posting_style Regards, Shlomi Fish I am only on pg 21 of Learning Perl 5th ed. I am trying as many variations of the examples just to mess around and see what happens with different characters. Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Optimising Code for Speed - http://shlom.in/optimise Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
RE: double quotes are needed
Ok, this is my final draft. Though it is syntactically correct, is it a good way to assign variables? #!/usr/bin/perl use strict; use warnings; my $first = 0xFF; my $second = 0377; my $third = 0b; my $answer = $first + $second + $third; print $first, $second, $third\n; print $answer\n; Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -Original Message- From: Shlomi Fish [mailto:shlo...@iglu.org.il] Sent: Wednesday, January 06, 2010 1:48 PM To: beginners@perl.org Cc: Grove, Michael Subject: Re: double quotes are needed On Wednesday 06 Jan 2010 20:38:29 Grove, Michael wrote: Thanks. Is this better? print $first, $second, $third,\n; Yes, but you can also write it as: print $first, $second, $third\n; 255, 255, 255 765 If I put the second set of quotes after the last comma, I get an error. What do you mean by that? How are you writing it? Also, please avoid top-posting and quote my reply: http://en.wikipedia.org/wiki/Posting_style Regards, Shlomi Fish I am only on pg 21 of Learning Perl 5th ed. I am trying as many variations of the examples just to mess around and see what happens with different characters. Mike Grove | AIX System Administrator OIT - BIO - Server Farms Division PA Department of Labor Industry 651 Boas Street Room 124 | Harrisburg, PA 17121 Phone: 717-705-2724 | Fax: 717-783-6364 AIX Hot Line 717-525-5598 | AIX Cell 717-329-0502 -- - Shlomi Fish http://www.shlomifish.org/ Optimising Code for Speed - http://shlom.in/optimise Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: double quotes are needed
Hi! On Wednesday 06 Jan 2010 21:10:16 Grove, Michael wrote: Shlomi, what is top posting? where you said: please avoid top-posting and quote my reply Please see: http://en.wikipedia.org/wiki/Posting_style . I gave you that link in my reply. Regards, Shlomi Fish -- - Shlomi Fish http://www.shlomifish.org/ Parody on The Fountainhead - http://shlom.in/towtf Bzr is slower than Subversion in combination with Sourceforge. ( By: http://dazjorz.com/ ) -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
