Hi ww,

When I run the OP's script with use warnings; added I don't see a warning for printing "@a" but I do get one for print $a[-2] since there is only one element in the OP's array. Here is the warning I get:

Use of uninitialized value in print at C:\usr\pm\sort\1164677.pl line 7.

When you print an array inside of double quotes it adds a space by default between the elements or whatever the output field list separator, "$," '$"', is set to. How do I print an array with commas separating each element?

Update: I forgot to mention also at the line (my @newstring) = sort {$a <=> $b} @numbers; you don't need the parentheses since defining an array is already in array context. These are nitpicky comments since your program works and answered the OPs questions, but it's my 2 cents worth.

Update: Fixed the separator as pointed out by AnomalousMonk