#include <iostream>
#include <bitset>
#include <cassert>
 
int main() {
    const std::bitset<8> b8 { 0b110111 };
    size_t index { 0 };
    assert(index < b8.size());
    std::cout << b8[index] << std::endl;
    index = 6;
    assert(index < b8.size());
    std::cout << b8[index] << std::endl;
}