Logic:
A 64-bit integer can be viewed as an array of 64 bits,  with the bit at index 0 corresponding to the least significant bit and the bit at index 63 corresponding to the most significant bit.
To extract i^th of an integer, you have to simply right shift to number with i times and apply and (&) bitwise operator with 1, if true then  i^th bit was 1 otherwise 0.

Program:

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char** argv) {
    int a = 8;  // Original number 
    int i = 2 ; // ith bit 
    int x = a >> i ;  // right sift of a number ith times. 
    if (x & 1 ) {  // comparing  with 1 
        cout << "1 ";
    }else { 
        cout << " 0 " ;
    }
    return 0;
}