Is a parameter defined

   

sub addem
{
    ($value1, $value2) = @_;
    if (!defined($value2)) {
        $value2 = 1
    };
    print "$value1 + $value2 = " . ($value1 + $value2);
}

addem(2);

1.	Swap array value by using the sub range
2.	Passing Arrays
3.	Pass file handle global reference to a subroutine
4.	Pass reference to a subroutine to another subroutine
5.	Pass two array reference to a subroutine
6.	Passing an array and modifying it,as a reference
7.	Passing by reference with pointers
8.	Passing References to a Subroutine
9.	Passing a range of value to a subroutine
10.	Passing array to a subroutine
11.	Passing arrays to a function
12.	Passing different number of parameter to a subroutine
13.	Passing hash to a subroutine
14.	Passing parameters to subroutines
15.	Passing two values to a subroutine
16.	displays all the arguments
17.	Using shift(@_) to get value passed into a subroutine
18.	shift parameter
19.	Subroutine parameter default value
20.	output the subroutine arguments using special variable @_
21.	The loop displays each individual argument

Is a parameter defined : Parameter « Subroutine « Perl

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