#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
  int i;
  i = 1;              // okay
  
  const int cI = 1;   // value of cI1 cannot be changed
  cI = 2;             // error

  int * pI = &i;      // both pI and *pI can be modified
  *pI = 2;            // okay
  pI = &cI;           // error (warning)
  
  const int * pCI = &cI; // value of *pCI cannot be changed
  *pCI = 2;           // error
  pCI = &i;           // okay
  
  int * const cPI = &i; // value of cPI cannot be changed
  cPI = &i;           // error
  
  const int * const cPcI = &cI; // neither ccPI nor *ccPI can be changed
  cPcI = &cI;         //  error
  *cPcI = 3;          //  error
  
  return  EXIT_SUCCESS;
}