What is the value printed by the following pseudo-code program for each of the f

Question

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-by- value/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(in out x: integer, in y: integer) x: = x + 1 a: = y begin//main program a: = 2 p(a, a) write integer(a) end

Explanation / Answer

call by value
a=2
p(2,2)
x=2+1 = 3
a = 2

result : 2

call by refrence
a=2
p(refrence of a,refrence of a)
x= 2+1 = 3
a = 3

result : 3

call by value result
a=2
p(a,a)
x= 2+1 = 3
a = 2

result : 3

call by name
a=2
p(a,a)
x=2+1 = 3
a=2

result : 2

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