C,const and pointers, position comparison table

A combination of const and pointers:

The comment section indicates illegal.

    intA =1; Const int*p =0; P=&A; //*p = 1;    int Const*PP =0; PP= &A; //*pp = 1;    int*ConstPV =0; //pv=&a;*PV =1; Const int Const*PAVP =0; //PAVP = &a; //*PAVP = 1;     Const int*ConstPBVP =0; //PBVP = &a; //*PBVP = 1;    int Const*ConstPCVP =0 ; //PCVP = &a; //*PCVP = 1;

The following code can be a key: because C + + has no const* operator, Const can only belong to the preceding type.

    int a =1;     int* int_ptr;     Const INT_PTR p=0;     // p=&a;    1 ;     Const pa=0;     // pa=&a;    1;

When const is placed at the top, only the right combination is selected.

The const int *P indicates that int is immutable, *p is a const.

int* Const p indicates that the pointer p cannot be changed, but its *p is mutable.

C,const and pointers, position comparison table