#include<iostream>
#include<fstream>
using namespace std;
struct test {
    int a;
    int b;//overall:8B
};
struct test2 {
    char ch;
    int num;//overall:8B
};
int main() {
    ofstream f("test.bat", ios::binary);
    test obj = { 3,4 };
    test2 obj = { 'a',4 };
    f.write((const char*)&obj, sizeof(test));
    f.write((const char*)&obj, sizeof(test2));
    return 0;
}