# Java Programming - Operators and Assignments - Discussion

### Discussion :: Operators and Assignments - Pointing out the correct statements (Q.No.4)

4.

Which two statements are equivalent?

1. 3/2
2. 3<2
3. 3*4
4. 3<<2

 [A]. 1 and 2 [B]. 2 and 3 [C]. 3 and 4 [D]. 1 and 4

Explanation:

(1) is wrong. 3/2 = 1 (integer arithmetic).

(2) is wrong. 3 < 2 = false.

(3) is correct. 3 * 4 = 12.

(4) is correct. 3 <<2= 12. In binary 3 is 11, now shift the bits two places to the left and we get 1100 which is 12 in binary (3*2*2).

 Firoz said: (Aug 17, 2012) I Can't Understand it. Explain clearly...

 Raju Royal.Sp said: (Jul 2, 2013) @Firoj. This is not critical problem observe clearly if the given equation can be solve first then you will identified easily, (1) 3/2 = 1.5 (2) 3<2 this is false because 3 is not lesser than 2 (3) 3*4 = 12 (4) 3 <<2 means if the binary value of 3 is 11 i.e 1*2^1+1*2^0 = 2+1 = 3. << means get 00 to the right side of 11. So 1100 means 12. So 3 and 4 are equal that's why answer is C.

 Kallu said: (Feb 1, 2016) I am so dumb, can't understand that binary stuff.

 Ganny said: (Feb 11, 2016) Just remember this thing : four digit binary == 8 4 2 1. Ex: 3 you want binary value: Above series 3 will come by adding 1 and 2. So put 1 in place of 1 and 2, now 3 binary will look like 0011. Now come into question he is shifting two bits right side so becomes 1100 means 12. So we are already know that 2^0*0 + 2^1*0 + 2^2*1 +2^3*1 = 12. So finally concluded that 3*4 and 3 << 2 are equals.

 Annu said: (Mar 27, 2016) Java 'Javac' command.

 Memr said: (Jan 19, 2017) Great explanation @Raju Royal & @Ganny. So we need to change 3 to binary it's : 3 = 2 +1 = 1*2^1+1*2^0 => we've got 11 but also shift the bits two places to the left and we get 1100 which is 12.

 Priya said: (Apr 8, 2017) Once again please explain me clearly. I can't understand the given explanation.

 Vishu said: (Feb 15, 2018) 3 means in binary 0011. shift 2 means 1100. 1100 means decimal 12.

 Mon said: (Nov 21, 2019) Is this symbol << represents bitwise operators?

 Mukesh Patel said: (Feb 10, 2020) The explanation is too good.