Two-dimensional array/While statement not exiting - very strange 1

[sloppyhack]

I am trying to cycle through all of the "rows" of a two dimensional array. I can cycle through and access/print the elements I want, but the loop does not exit? Here's an example of the code.

while (@aliasdata) {
++$aliasrow;
print TEMP $aliasdata[$aliasrow][1],"\n";
}

@aliasdata remains true and I get an infinite loop which prints the elements of the file but continues to print "\n" indefintely. Works without using the $aliasrow variable? Anyone know why this is happening?

Thanks
Bryant
Boulder CO

 

[raider2001]

The statement 'while (@aliasdata)' is true as long as @aliasdata is defined. Since the while loop does not modify the array @aliasdata, the while statement will always be true. A 'for' loop would work better in this situation.

for ($aliasrow=0; $i<=$#aliasdata; $aliasrow++) {
print TEMP $aliasdata[$aliasrow][1],&quot;\n&quot;;
}

 

[sloppyhack]

Thanks. I am still getting the same result. The loop is not exiting. Prints the correct elements of the file but continues to print &quot;\n&quot; indefinitely? Does it have something to do with the fact that it's a two-dimensional array?

Bryant

 

[sloppyhack]

Here's something else that's strange. $alisedata is null? I would expect it to be equal to the number of elements in that array. The fact that this is a two-dimensional array must be screwing things up.

 

[raider2001]

Sorry about that. The problem is that I put the index that I usually use '$i' where $aliasrow should have been. The following should work:

for ($aliasrow=0; $aliasrow<=$#aliasdata; $aliasrow++) {
print TEMP $aliasdata[$aliasrow][1],&quot;\n&quot;;
}

 

[sloppyhack]

Nice!!! Yep that worked. Not used to using &quot;$#&quot; to define the number of elements in an array. Works though.

Thank you so much!

Bryant

 

[llucifer]

Another - more perlish - way is:

foreach (@aliasdata) {
print TEMP $_->[1];
}

This make no use of temporary variables.