Please explain me this!!!!

Question

#include <iostream>
using namespace std;

int main() {
cout<<(4<<1);
return 0;
}

Answer 1

<< is the bitshift operator to the left. The value on the right side is the amount of positions the number on the left is shifted.

For example 4 in binary is 100, shifting one position to the left would give 1000, which is 8. So in effect it multiplies the number.

Answer 2

https://code.sololearn.com/co8vZnCO3bk4/?ref=app

to understand bit shift operator take a look at this code