why print(2 <<3)is 16?

Answer 1

its in binary

2 equals 0010
(0010 << 3) == 0001 0000 #left shift 3
0001 0000 equals 16

Answer 2

Please use the search bar, similar questions have been asked may times
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Answer 3

Another attempt in addition to what Slick wrote:

2 = 2^1
Left shift by three adds 3 to exponent so it is
2^(1+3) = 2^4 = 16