#include #pragma pack(push, 1) struct test { bool b1:1; bool b2:1; bool b3:1; bool b4:1; bool b5:1; bool b6:1; bool b7:1; bool b8:1; }; #pragma pack(pop) int main() { test t; *(bool*)(&t) = 0; t.b1 = 1; t.b2 = 0; t.b3 = 1; t.b4 = 0; t.b5 = 1; t.b6 = 0; t.b7 = 1; t.b8 = 0; std::cout << t.b1 << " " << t.b2 << " " << t.b3 << " " << t.b4; std::cin.get(); }