Function Declare in Perl

In Perl, we can declare a method or function using the sub keyword. Here is an example of how to declare a function that takes two arguments and returns their sum:

sub add_numbers {
    my ($num1, $num2) = @_;
    my $sum = $num1 + $num2;
    return $sum;
}

In the above example, we have defined a function called add_numbers which takes two arguments, $num1 and $num2.

The my keyword is used to declare local variables within the function. Here we are declaring $sum as a variable to hold the sum of the two input numbers.

The arithmetic operation of $num1 + $num2 is used to calculate their sum, which is then assigned to the my variable $sum.

Finally, the return statement is used to return the computed sum to the caller of the function.

Here is an example of how to use the above function:

my $result = add_numbers(5, 10);
print "The sum of 5 and 10 is $result\n";

In the above example, we are passing the numbers 5 and 10 as arguments to the add_numbers function.

The function computes their sum, which is then stored in the $result variable.

Finally, we are using the print statement to display the computed sum to the user.

The output of the above code will be: The sum of 5 and 10 is 15.