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Invoke a subroutine from within any expression by using the subroutine name (with the ampersand):[103]
[103]And frequently a pair of parentheses, even if empty. As written, the subroutine inherits the caller's @_ value, which we'll be discussing shortly. So don't stop reading here, or you'll be writing code with unintended effects!
&marine; # says Hello, sailor number 1! &marine; # says Hello, sailor number 2! &marine; # says Hello, sailor number 3! &marine; # says Hello, sailor number 4!
Sometimes, we refer to the invocation as calling the subroutine.
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| 4.2. Defining a Subroutine |  | 4.4. Return Values |
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