The difference between const char *, char * const of

. 1 #include <the iostream>
 2  
. 3  int main () {
 . 4      
. 5      char   C1 = ' A ' ;
 . 6      char   C2 = ' B ' ; 
 . 7      
. 8      const  char * & P = C1;
 . 9  //   * P = 'B'; // error                  
10       P = & C2; // to                  
 11  @ Conclusion: declared const char * pointer, which points to the memory space can not be modified 
12 is      
13 is      char * const P2 = & C1;
 14     = P2 * ' B ' ; // to
 15  //    P2 = & C2; // dislocation 
 16  @ Conclusion: char * pointer declared const, which points to the memory address can not be modified (not modify pointer to) 
. 17      return  0 ;
 18 }

 Reference: https://www.runoob.com/w3cnote/const-char.html