Question 6922 – UGC NET CS 2015 Dec – paper-3
April 14, 2024Programming
April 14, 2024Programming
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Question 6
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What does the following code do?
var a, b : integer;
begin
a:=a+b;
b:=a-b;
a:=a-b
end;
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exchanges a and b
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doubles a and stores in b
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doubles b and stores in a
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leaves a and b unchanged
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none of the above
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Question 6 Explanation:
Exchanges a and b.
Let us consider a=5; b=2
a := a+b = 5+2 = 7
b := a-b = 7-2 = 5
a := a-b = 7-5 = 2
O/P: a=2; b=5
Let us consider a=5; b=2
a := a+b = 5+2 = 7
b := a-b = 7-2 = 5
a := a-b = 7-5 = 2
O/P: a=2; b=5
Correct Answer: A
Question 6 Explanation:
Exchanges a and b.
Let us consider a=5; b=2
a := a+b = 5+2 = 7
b := a-b = 7-2 = 5
a := a-b = 7-5 = 2
O/P: a=2; b=5
Let us consider a=5; b=2
a := a+b = 5+2 = 7
b := a-b = 7-2 = 5
a := a-b = 7-5 = 2
O/P: a=2; b=5