Parentheses and Local Variables
In the code below it seems that surrounding the variable name ($total) in parentheses when declaring it as local (in the sub "change_total"), gives a different output, (when the last call to sub show_total is executed), than if the variable appears without parentheses.
If the parentheses are left off, the last call to sub show_total accesses the global version of $total instead.
The output of the script is as follows:
With brackets
0
5
5
Without brackets
0
5
0
$total = 0;
show_total();
change_total();
show_total();
sub change_total
{
local($total) = 5;
show_total();
}
sub show_total
{
print('$total equals '. "$total\n");
}I would be greatful if someone could explain the difference to me.
THANX
Greg K posted this at 01:31 — 18th August 2006.
He has: 2,145 posts
Joined: Nov 2003
Just to clarify, which language is this?
-Greg
StuPeas posted this at 08:28 — 18th August 2006.
They have: 36 posts
Joined: Oct 2004
Sorry Greg, The language is Perl
StuPeas posted this at 11:51 — 18th August 2006.
They have: 36 posts
Joined: Oct 2004
It appears that after my laptop has been off for the night, the behaviour explained has vanished, and both parentheses and no parentheses give the same result.
I cant explain it, but there you go!
THANX anyway
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