int &rNum; //未初始化不能通过编译 
int *pNum; //可以 

int iNum = 10; 
int iNum2 = 20; 
int &rNum = iNum; 
&rNum = iNum2; //不能通过 

int *pNum = NULL; //可以 
int &rNum = NULL;//不可以 

char c1 = 1; 
char* pc = &c1; 
char& rc = c1;
cout<<sizeof(pc)<<sizeof(rc)<<endl; //输出4 1 

rNum++; //指针的内容改变 
pNum++; //指针改变 

int &&rNum ; //不可以 
int **ppNum; //可以 

int Num = 10;
012213BE mov     dword ptr [Num],0Ah 
int &rNum = Num;
012213C5 lea     eax,[Num] 
012213C8 mov     dword ptr [rNum],eax 
int *pNum =&Num;
012213CB lea     eax,[Num] 
012213CE mov     dword ptr [pNum],eax