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programming and data structure

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que--Study the following program written in a block structured language.

var p, q : integer;

begin

            p:= p+q;

            q:= p−q;

            p:= p−q;

end;

(a) exchanges (p) and (q)                                            (b) doubles (p) and stored in (q)

(c) doubles (q) and stores in (p)                                  (d) leaves (p) and (q) unchanged
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