int？ Major (invalid)

{

int？ Answer? =? 0;

Short? b？ =? 0;

Dragon? int？ c？ =? 0;

STD::cout & lt； & lt

sizeof(a)& lt； & ltSTD::endl & lt； & lt

sizeof(b)& lt； & ltSTD::endl & lt； & lt

sizeof(c)& lt； & ltSTD::endl；

Return? 0;

}4 2 4 (depending on the system and compiler)

Although this is the foundation, the ability to find a way by yourself is also important.