Shift Operator (<<) Explanation

Question

Can anyone tell me what this is doing:

    System.out.println(1 << val);

for val = 17, the answer is coming as: 131072

can you explain related to the example given – user2958104 Nov 15 '13 at 23:26 — user2958104, Nov 15 '13 at 23:26

score 1 · Answer 1 · edited May 23 '17 at 12:06

1

http://docs.oracle.com/javase/tutorial/java/nutsandbolts/op3.html

This is a bitwise operation. Basically you are shifting the bits that originally made up your variable, and then those bits now represent a new number.

In this case, you shift to the left a few spots, which suddenly adds a lot more bits into your number... adding a greater value to it.

How do shift operators work in Java?

edited May 23 '17 at 12:06

Community

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answered Nov 15 '13 at 23:26

SnakeDoc

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score 1 · Accepted Answer · answered Nov 15 '13 at 23:30

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Binary representation of 1 is 00000000000000000000000000000001

1 << 17 will move the last 1 in the binary representation 17 places left, which will result in 0000000000000100000000000000000, which when converted back to decimal results is 131072

answered Nov 15 '13 at 23:30

Mariusz Jamro

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Shift Operator (<<) Explanation

2 Answers2