Re: sum of integers in a column

You're on the right track, but you're keeping only one total, whereas there are more than one columns. Suddenly I have this nagging feeling that an array to keep the sums would be useful.

A very small hint:

while (my $line = <>) {
    my @column = split(' ', $line); 
#    $sum[$_] += $column[$i] for 0..$#column;
# line corrected by mjscott7202 into:

    $sum[$_] += $column[$_] for 0..$#column;

}
[download]

That's two hints, actually. Or three, depending on how you look at it. Anyway, on a side note: you'll also want to use strict; and use warnings;. This will help you catch a lot of errors, typoes, and other mistakes.

Comment on Re: sum of integers in a column Select or Download Code

Replies are listed 'Best First'.
Re^2: sum of integers in a column by mjscott2702 (Pilgrim) on Oct 12, 2010 at 12:36 UTC
Shouldn't that be: `$sum[$_] += $column[$_] for 0..$#column;` I presume the $i should actually be the default index variable $_ generated by the for loop?	[reply] [d/l]
Re^3: sum of integers in a column by muba (Priest) on Oct 12, 2010 at 12:41 UTC
You're quite right. Initially I wrote it with a `for my $i (...) {...}` loop but then thought I could do it with a postfix for. Forgot to replace that one instance of `$i` with `$_`. Corrected. Thank you :)	[reply] [d/l] [select]
Re^4: sum of integers in a column by mjscott2702 (Pilgrim) on Oct 12, 2010 at 12:44 UTC
Luckily using strict and warnings would have highlighted the typo :)	[reply]
Re^4: sum of integers in a column by ww (Archbishop) on Oct 12, 2010 at 22:00 UTC
- - for failure to add the pragmas you advocated -- which would have shown you that your correction is still incorrect.	[reply]