| 11. | And users could regard them as if they were ordinary subroutines.
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| 12. | Methods are subroutines with the ability to operate on objects or classes.
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| 13. | Macros can also contain sub-macros which are similar to subroutines.
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| 14. | This allowed module authors to make subroutines that behaved like Perl builtins.
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| 15. | Functional programming languages define programs and subroutines as mathematical functions.
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| 16. | Often, subroutines accessible via the operating system kernel are not reentrant.
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| 17. | The other 48 registers were actually the top of the subroutine stack.
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| 18. | Speculative subroutine calls and interrupts are dealt with without incurring branch penalties.
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| 19. | The calling code does nothing but list the subroutines to be called.
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| 20. | It has subroutines and user functions with passed parameters and local variables.
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