What is the difference between the const in C + + and C language?

It is well known that the C language can be modified by using const;

C language can be modified by  
the pointer int  main ()  
{  
//So to speak in C language A is a read-only constant. According to the theory we are not easy to modify//  
const int a=10;

printf ("%x", &a); The constant A in the//c language  can be addressed.  
int *p=null;  
p= (int *) &a;     But can modify *p=11 by address  
;  
printf ("After%d Modified", a);  
}

This is a can be modified;

But look at the following C + + inside the

and in C + +, it can be defined like this.

The C + + compiler puts him in the symbol table during compilation  
//A is a true constant according to the above.  
int const A = ten;  
      
int  const B = one;  
The length is given down at compile time  
//  array [10+11]//inside must be a constant; C + + compiled with fixed length  
//So this is OK, but in C language it can't be  
int Array[a + b] = {0};

If the brother has an unreasonable explanation, you can leave a comment, because the younger brother is also new;