Q. Which of the following expressions can be used to multiply a given number ‘a’ by 4?
✅ Correct Answer: (B)
a<<4
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.