[C++] Add program to Startup Example

//virus.cpp

#include <windows.h>
//#include <string>

int main(int argc, char *argv[]){
    HKEY hkey;
    char szBuf[] = "C:\\Windows\\notepad.exe";

    RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\Currentversion\\Run", 0, KEY_SET_VALUE, &hkey);
    RegSetValueEx (hkey, "notepad.exe", 0, REG_SZ, (LPBYTE) szBuf, strlen(szBuf) + 1);
    RegCloseKey(hkey);

    MessageBox(NULL,"Notepad added to startup...","Info",MB_OK);
    return 0;
}