Hi,
   I have attached the code and output below..
Thanks


#! /usr/bin/perl
print "Testing Subroutine parameter passing\n";
my $var1 = "var1";
my $var2 = "var2";
my_sub1($var1, $var2);
print "End Test\n";


sub my_sub1 {
my $var1 = shift;
my $var2 = shift;

my ($var3, $var4);
my @undef1 = ();
if ($var1 eq "var2") {
$var3 = $var1;
}
if ($var2 eq "var2") {
$var4 = $var2;
}

print_vars($var1, $var3, @undef1, $var4);
}

sub print_vars{
my $var1 = shift;
my $var3 = shift;
my @undef1 = shift;
my $var4 = shift;

print "Var1: $var1\n";
print "var3: $var3\n";
print "undef1: @undef1\n";
print "var4: $var4\n";

}


OUTPUT:
Testing Subroutine parameter passing
Var1: var1
Use of uninitialized value in concatenation (.) at ./passtest.pl line 
+32.
var3: 
undef1: var2
Use of uninitialized value in concatenation (.) at ./passtest.pl line 
+34.
var4: 
End Test
[download]

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