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Programming-parameter passing

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what will be the output if z is passed as a) call by value b) call by reference .Please Explain also.

z: integer

recur(x)

{

if(x<=40)then

{ x=x+z;

recur(x);

z=x+10;

}}

main()

{

z:=10;

recur(z);

write(z);

}
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