printing array problem

[Mark Day]

Any tips on what I'm doing wrong here appreciated.

I'm using perl version 5.6.1 on Win98,

and this test script i've written, I was hoping would print each element
of this array, on a new line, then print the array again in reverse order.

What actually output's is the same array twice with all elements printed
on the same line.

What is wrong with my attempt to reverse the array, adn why does each
scalar not print on a new line?

thanks.

--code snippet---

#!C:\perl\bin\perl

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

foreach (@array)

{

print $_;

print "\n";

}

@array = reverse @array;

foreach (@array) {

print $_;

print "\n";

}

 

[Mark Clements]

Any tips on what I'm doing wrong here appreciated.

I'm using perl version 5.6.1 on Win98,

and this test script i've written, I was hoping would print each element
of this array, on a new line, then print the array again in reverse order.

What actually output's is the same array twice with all elements printed
on the same line.

What is wrong with my attempt to reverse the array, adn why does each
scalar not print on a new line?

thanks.

--code snippet---

#!C:\perl\bin\perl

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

qq() gives you an interpolated string - man perlop. what you are
effectively doing here is

@array = "1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen";

which will set $array[0] to "1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen"
and leave the rest of the array empty.

you probably mean

my @array = qw(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

though that will give you "baker's" and "dozen" as separate array elements.

You can also skip the

@array = reverse @array

step

ie

foreach( reverse @array){

....

Mark

 

[Mark Day]

qq() gives you an interpolated string - man perlop. what you are
effectively doing here is

@array = "1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen";

which will set $array[0] to "1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen"
and leave the rest of the array empty.

you probably mean

my @array = qw(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);
though that will give you "baker's" and "dozen" as separate array elements.

You can also skip the

@array = reverse @array

step

ie

foreach( reverse @array){

...

Mark

Great! thanks.

 

[Anno Siegel]

Any tips on what I'm doing wrong here appreciated.

I'm using perl version 5.6.1 on Win98,

and this test script i've written, I was hoping would print each element
of this array, on a new line, then print the array again in reverse order.

What actually output's is the same array twice with all elements printed
on the same line.

What is wrong with my attempt to reverse the array, adn why does each
scalar not print on a new line?

thanks.

--code snippet---

#!C:\perl\bin\perl

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

[snip]

Look up what qq() does. I guess you meant to say qw() instead.

Anno

 

[Graham Wood]

hoping would print each element
of this array, on a new line, then print the array again in reverse order.

What is wrong with my attempt to reverse the array, adn why does each
scalar not print on a new line?


#!C:\perl\bin\perl

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

Your problem is that you're using qq which will surround the contents of
the parenthesis with double quotes rather than qw which will surround
each word in the parenthesis with double quotes. You are basically
creating and array with one element in it: "1 2 3 4 5 6 7 8 9 10 11 12
baker's dozen" and reversing this then gives you the same single element
in reverse order.

Replace qq with qw and see what happens.

Graham

 

[Anno Siegel]

Mark Day wrote:
[...]

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

Your problem is that you're using qq which will surround the contents of
the parenthesis with double quotes rather than qw which will surround
each word in the parenthesis with double quotes.

That is wrong. "qw()" surrounds the whole string with single quotes,
then splits the result on whitespace.

Anno

 

[Anno Siegel]

Mark Day wrote:
[...]

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

Your problem is that you're using qq which will surround the contents of
the parenthesis with double quotes rather than qw which will surround
each word in the parenthesis with double quotes.

That is wrong. "qw()" interprets the whole string in single-quote
style, then splits the result on whitespace.

Anno

 

[Anno Siegel]

Mark Day wrote:
[...]

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

Your problem is that you're using qq which will surround the contents of
the parenthesis with double quotes rather than qw which will surround
each word in the parenthesis with double quotes.

That is wrong. "qw()" treats the whole string as single quoted,
then splits the result on whitespace.

Anno

 

[Graham Wood]

Mark Day wrote:
[...]

@array = qq(1 2 3 4 5 6 7 8 9 10 11 12 baker's dozen);

Your problem is that you're using qq which will surround the contents of
the parenthesis with double quotes rather than qw which will surround
each word in the parenthesis with double quotes.

That is wrong. "qw()" treats the whole string as single quoted,
then splits the result on whitespace.

Oh. Thanks

Graham