Here's what I got when I ran it:
C:\>perl hello2.pl
Name your friends: Joe Sam Sally
I know .
(good news is that ctrl-z appears to be working again)
When I ran it a second time and skipped a line, it when to the print message after I
skipped a line after Sam.
C:\>perl hello2.pl
Name your friends: Joe
Sam
I know .
This is driving me crazy! I can't sleep at night! I need to solve this problem!! I
need help!! ARGH!!!!
-----Original Message-----
From: Perry, Alan [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 25, 2003 1:38 PM
To: '[EMAIL PROTECTED]'
Cc: Anthony Beaman
Subject: RE: Array Question
Oops, the second batch of code has a problem... It should read:
print "Name your friends: ";
$friends = <STDIN>;
chomp($friends);
@names = split(/ +/, <STDIN>);
print "I know $names[1].\n";
Sorry about that...
- Alan
-----Original Message-----
From: Perry, Alan [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 25, 2003 12:34
To: 'Anthony Beaman'; [EMAIL PROTECTED]
Subject: RE: Array Question
Unlike others that are suggesting that you forget about user input, I
thought you might want to see how it can work on Windows. I know that
it
would bug me as to how to do this if I were in your position...
print "Name your friends: ";
@names = split(/[ \n]+/, <STDIN>);
print "I know $names[1].\n";
The second line is the "magic". The "split" function takes a string
and
splits it up into pieces (a list) which you can put into an array.
The first parameter is a regular expression to search for. Assuming
you
have not gotten to regular expressions yet, the parameter I used, "/[
\n]+/", say to the split function to search for one or more spaces or
end-of-line characters and that is what I want to split on.
The second parameter is the string you want to search, in this case,
the
input you typed in.
The only problem with the above approach is that you will wind up with
an
extra item. Using your names, the array would contain:
$names[0] = "Sam"
$names[1] = "Joe"
$names[2] = "Sally"
$names[3] = ""
The extra null-string at the end is because of the end-of-line
character at
the end of the string you typed in. If you wanted to not have that at
the
end, you could change your code to something like this:
print "Name your friends: ";
$friends = <STDIN>;
chomp($friends);
@names = split(/[ +/, <STDIN>);
print "I know $names[1].\n";
The "chomp" line above removes the end-of-line character, so you will
only
have three elements in your array.
There are a lot of other tricks you can do, but I have probably
confused you
enough for now... :)
- Alan
-----Original Message-----
From: Anthony Beaman [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 25, 2003 11:01
To: [EMAIL PROTECTED]
Subject: RE: Array Question
The plot thickens! I can get it to work if I have a data in the array,
such
as my script below:
print "Here are your friends: ";
@friends = qw (Sam Joe Sally);
print "@friends\n";
print "I know $friends[1]";
I still can't grab the element of an array that requests user input
though.
-----Original Message-----
From: Derek Byrne [mailto:[EMAIL PROTECTED]
Sent: Wednesday, June 25, 2003 8:33 AM
To: [EMAIL PROTECTED]
Subject: RE: Array Question
Hi Anthony,
grabbed this from O'Reilly's Learning Perl :
@rocks = qw/ bedrock slate lava /;
foreach $rock (@rocks) {
$rock = "\t$rock"; # put a tab in front
of
each element of
@rocks
$rock .= "\n"; # put a newline on
the end
of each
}
print "The rocks are:\n", @rocks; # Each one is
indented, on
its own line
Still learning how to grab input from user via chomp,
but
this should help
you work out how to print out all entries in an array
using
the foreach
thingy :o)
DerekB
-----Original Message-----
From: Anthony Beaman [mailto:[EMAIL PROTECTED]
Sent: 25 June 2003 13:24
To: [EMAIL PROTECTED]
Subject: Array Question
Hi! I'm still wallowing in Chapter 3 (Arrays. Why
can't I
get it?!?!?!?
ARGH!!!!!) of Learning Perl on Win32 Systems. I'm
trying to
create an
exercise but I'm not getting the results that I want.
Here's
what I'm trying
to do:
I'm asking for a list of names:
print "Name your friends: ";
@names = <STDIN>;
Then I want to pretend that I know the one of the
friends.
In this case,
I'll choose the 2nd one and here's where I'm not
getting
what I want:
print "I know $names[1].\n";
The output shows "I know ."
Isn't "$names[whatever]" what I'm supposed to use to
get an
element of the
array? I've tried this with numbers and have gotten
the same
results. What
am I doing wrong? Thanks! :-)
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