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### hw7

Course: COP 4020, Spring 2011
School: FSU
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Word Count: 195

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Spring COP4020 2011 Homework Assignment 7 1. Consider the following pseudo-code program: sum : integer // a global variable procedure add(amount : integer) sum := sum + amount procedure p(x : integer, adder : procedure) integer sum sum := x adder(x) // invoke procedure that was passed as argument write_integer(sum) begin // main program sum := 0 p(1, add) end a. Suppose dynamic scoping with shallow binding is...

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Spring COP4020 2011 Homework Assignment 7 1. Consider the following pseudo-code program: sum : integer // a global variable procedure add(amount : integer) sum := sum + amount procedure p(x : integer, adder : procedure) integer sum sum := x adder(x) // invoke procedure that was passed as argument write_integer(sum) begin // main program sum := 0 p(1, add) end a. Suppose dynamic scoping with shallow binding is used by the interpreter to execute this code. What is the value printed by the program? b. Suppose dynamic scoping with deep binding is used by the interpreter to execute this code. What is the value static printed? c. 2. Suppose scoping is used. What is the value printed by the program? What is the value printed by the following pseudo-code program for each of the four parameter passing modes call-by-value, call-by-reference, call-byvalue/result, and call-by-name? That is, for each of the four parameter passing modes assume that both the x and y parameters use that mode. Show how each program is evaluated in that mode and show the final value printed: a : integer // a global variable procedure p(x : integer, y : integer) x := x + 1 a := y begin // main program a := 2 p(a, a) write_integer(a) end
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