1
GATE CSE 1993
MCQ (Single Correct Answer)
+2
-0.6
What does the following code do?
var a, b : integer;
begin
    a:=a+b;
    b:=a-b;
    a:=a-b;
end;
A
exchanges a and b
B
doubles a and stores in b
C
doubles b and stores in a
D
leaves a and b unchanged
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