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Chapter 8 Discussion

Chapter 8 Discussion. Chapter 8.1-8.3 and 8.5 (pp 383-408 and 417-425). Parameter passing mechanisms. Work in small groups Don’t look at the text or your notes List as many parameter passing mechanisms as you can recall. For each mechanism list a feature it enables or a benefit it supplies.

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Chapter 8 Discussion

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  1. Chapter 8 Discussion Chapter 8.1-8.3 and 8.5 (pp 383-408 and 417-425)

  2. Parameter passing mechanisms • Work in small groups • Don’t look at the text or your notes • List as many parameter passing mechanisms as you can recall. • For each mechanism list a feature it enables or a benefit it supplies

  3. Call by value • The following E3 program passes parameters by value. ( (global x 5) (global y 2) (fun f (x y) (local (temp x) (block (:= x y)(:= y temp))))) (f x y) • At theend of theprogramwhatholds? choose 1 • X has value 5 • Y has value 5 • Y has value 0

  4. Call by reference • The following E3 program passes parameters by reference ( (global x 5) (global y 2) (fun f (a b) (local (temp x) (block(:= x y)(:= y temp))))) (f x y) • At theend of theprogramwhatholds? choose 1 • X has value 2 • Y has value 2

  5. Call by value-return • The following E3 program passes parameters by value return ( (global x 5) (global y 9) (fun f (a b c) (block(:= a 1) (:= b 2))) ) (:= y (f x x y)) • At theend of theprogramwhatholds? choose 1 • X has value 1 • Y has value 2 • Y has value 9

  6. In and Out parameters • Work in small groups • Don’t look at the text or your notes • What’s the difference between In, out, CBV, and CBR?

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