Re^2: &process or die

Thanks moritz

Now I understand, because my subroutine does NOT return a number. It makes mathematical operations on files and prints results but there is NOT a return so it is normal "die" is executed !

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Re^3: &process or die by toolic (Bishop) on Apr 18, 2008 at 16:42 UTC
my subroutine does NOT return a number. That is not true, according to the documentation for return, and as others in this thread have already pointed out: (Note that in the absence of an explicit "return", a subroutine, eval, or do FILE will automatically return the value of the last expression evaluated.) This is why moritz correctly pointed out that your sub is indeed returning a value, and it even might be numeric (0). Consider the following contrived example: `#!/usr/bin/env perl use warnings; use strict; my $result; $result = foo(); print "result=$result\n"; $result = bar(); print "result=$result\n"; sub foo {print "foo: "} sub bar {print "bar: "; chdir '/nodir'}` [download] This prints: `foo: result=1 bar: result=0` [download] sub "foo" returns the result of the successful print command, and sub "bar" returns the result of the unsuccessful chdir command.	[reply] [d/l] [select]

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Re^3: &process or die
by toolic (Bishop) on Apr 18, 2008 at 16:42 UTC

my subroutine does NOT return a number.

return

(Note that in the absence of an explicit "return", a subroutine, eval, or do FILE will automatically return the value of the last expression evaluated.)

moritz

Consider the following contrived example:

#!/usr/bin/env perl
use warnings;
use strict;

my $result;

$result = foo();
print "result=$result\n";
$result = bar();
print "result=$result\n";

sub foo {print "foo: "}
sub bar {print "bar: "; chdir '/nodir'}
[download]

This prints:

foo: result=1
bar: result=0
[download]

sub "foo" returns the result of the successful print command, and sub "bar" returns the result of the unsuccessful chdir command.

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