What does the compiler do in this code?;-)

Question

https://code.sololearn.com/cJaRHsVQi25o/?ref=app

Answer 1

It's a bitwise left shift by 3 bits.

1: 00000001
<<3: 00001000 (8)

Left shifting a number by one bit is the same as multiplying it by 2.

Answer 2

okk i also got it

Answer 3

It may be garbage value .