Q.

Which of the following expressions can be used to multiply a given number ‘a’ by 4?

A. a<<2
B. a<<4
C. a>>2
D. a>>4
Answer» A. a<<2
Explanation: let us consider an example wherein a=2. the binary form of 2 is 0010. when we left shift this value by 2, we get 1000, the value of which is 8. hence if we want to multiply a given number ‘a’ by 4, we can use the expression: a<<2.
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