Print ‘K’th least significant bit of a number
A number N is given. We need to print its ‘K’th Least Significant Bit.
Input : num = 10, k = 4 Output : 1 Explanation : Binary Representation of 10 is 1010. 4th LSB is 1. Input : num = 16, k = 3 Output : 0 Explanation : Binary Representation of 16 is 10000. 3rd LSB is 0.
We can easily solve this problem by following steps :
- Shift the number ‘1’ (K-1) times left.
- This will yield a number with all unset bits but the ‘K’th bit. Now, we’ll perform logical AND of the shifted number with given number.
- All bits except the ‘K’th bit will yield 0, and ‘K’th bit will depend on the number. This is because, 1 AND 1 is 1. 0 AND 1 is 0.
Time Complexity: O(1)
Auxiliary Space: O(1)
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