Strange perl print output behaviour

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# 1  
Old 09-23-2011
Strange perl print output behaviour

Today I have found the following case in perl:
print "length:$lengths[$i]\tsum:". $count{$lengths[$i]}+$count_pair{$lengths[$i]}."\tindi:$count{$lengths[$i]}\t$count_pair{$lengths[$i]}\n";

This give output as
22 indi:21 22
That means the first part of print is not printing. Only the values after the additions are printed. But if I calculate the sum in separate line and print , every variables are printed. I am not sure why it is so
$a = $count{$lengths[$i]}+$count_pair{$lengths[$i]};
print "length:$lengths[$i]\tsum:". $a."\tindi:$count{$lengths[$i]}\t$count_pair{$lengths[$i]}\n";

length:50 sum:36 indi:19 17
# 2  
Old 09-23-2011
just try this.

print "length:$lengths[$i]\tsum:" . "$count{$lengths[$i]}+$count_pair{$lengths[$i]}" . "\tindi:$count{$lengths[$i]}\t$count_pair{$lengths[$i]}\n";

# 3  
Old 09-23-2011
That doesn't work. Addition won't be done. By the way I am not asking for the solution, but for the reason behind this Smilie
# 4  
Old 09-23-2011
one of the problem could be new line character .

try chomp and print the result
# 5  
Old 09-23-2011
That is not the case too... Smilie if its the reason it should print the values in two lines.

I guess its something with operations in hash
# 6  
Old 09-23-2011
Instead of double quoting the addition, you should just put a pair of parentheses around it.
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