求高手解答类中各种sizeof问题

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 #include<iostream> using namespace std;
 
  class a{virtual void f(){}    double av;int ab; //virtual void f1(){} }; class b{//int  aa;int aad;     //virtual void f1(){} }; class c{//int aad
 ;}; class d{int aad; }; class e:public virtual a//,public virtual bublic virtual c,public virtual d {}; void main() {cout<<sizeof(e)<<endl;} 
输出是32；

  #include<iostream> using namespace std; class a{virtual void f(){}    double av;int ab; //virtual void f1(){} }; class b{//int  aa;int aad;     //virtual void f1(){} }; class c{//int aad     ;}; class d{int aad; }; class e:public virtual a,public virtual b,public virtual c//,public virtual d {}; void main() {cout<<sizeof(e)<<endl;} 输出是 36；

  #include<iostream> using namespace std; class a{virtual void f(){}    double av;int ab; //virtual void f1(){} }; class b{//int  aa;int aad;     virtual void f1(){} }; class c{//int aad     ;}; class d{int aad; }; class e:public virtual a,public virtual b,public virtual c//,public virtual d {}; void main() {cout<<sizeof(e)<<endl;} 输出是36；

  #include<iostream> using namespace std; class a{virtual void f(){}    double av;int ab; //virtual void f1(){} }; class b{int  aa;int aad;     virtual void f1(){} }; class c{//int aad     ;}; class d{int aad; }; class e:public virtual a,public virtual b,public virtual c//,public virtual d {}; void main() {cout<<sizeof(e)<<endl;} 
输出是44；

  #include<iostream> using namespace std; class a{virtual void f(){}    double av;int ab; //virtual void f1(){} }; class b{int  aa;int aad;     virtual void f1(){} }; class c{//int aad;     virtual void f2(){} }; class d{//int aad; }; class e:public virtual a,public virtual b,public virtual c,public virtual d {}; void main() {cout<<sizeof(e)<<endl;} 输出是48；