Why this code showing this result?

Question

Confusing
https://code.sololearn.com/cTKq5f4w7ard/?ref=app

Answer 1

Raju Baghel It's Bitwise Left Shift operator.
https://www.sololearn.com/learn/4087/?ref=app

Answer 2

That's a bitwise shift operator, in this case it shifts binary 2 digits to the left:
5 in binary = 00000101

after shifting those ones to the left:
00000101 --> 00010100

and 00010100 in numeral system is 20