What does the following C expression do? x = (x<<1) + x + (x>>1);
(A)
Multiplies an integer with 7
(B)
Multiplies an integer with 3.5
(C)
Multiplies an integer with 3
(D)
Multiplies an integer with 8
Answer: (B)
Explanation:
In the expression: x = (x<<1) + x + (x>>1);
(x<< 1) means left shift x by 1, by doing this we get, x*2.
(x>>1) means right shift x by 1, by doing this we get, x/2
After solving the above expression, we get
=x*2 + x + x/2
= 3*x +x/2
=7x/2
=3.5*x, Hence x is a multiple of 3.5
The expression multiplies an integer with 3.5. See for more details: https://www.geeksforgeeks.org/multiply-an-integer-with-3-5/amp/
Hence Option(B) is correct.
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