sub

sub name [proto] {block} sub [proto] name

• Declares and defines a subroutine. name is the name given to the subroutine; block is the code to be executed when the subroutine is called. Without block, this statement only declares a subroutine, which must be defined at some later point in your program. proto is a sequence of symbols that places constraints on the arguments that the subroutine will receive. See "Subroutines" in .