Const Pointers in C

const_affects_the_left_of_it.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int x,y;

char *make_string(char* message) {
  char* val= (char*)malloc(sizeof(message));
  strcpy(val,message);
  return val;
}

int main() {
  char const *mutable_pointer_immutable_char=make_string("hello");
  char * const imutable_pointer_mutable_char=make_string("byebye");

  const char *should_also_be_mutable_pointer_immutable_char=make_string("also_hello?");
  printf("%s vs %s\n", mutable_pointer_immutable_char, imutable_pointer_mutable_char);
  imutable_pointer_mutable_char[0] = 'X';
  printf("%s vs %s\n", mutable_pointer_immutable_char, imutable_pointer_mutable_char);
  // mutable_pointer_immutable_char[0] = 'y'; //--WRONG! read only location                                                                     
  //should_also_be_mutable_pointer_immutable_char[0] = 'x'; //--WRONG!read only location                                                        
  // imutable_pointer_mutable_char = mutable_pointer_immutable_char; //-- WRONG! read only variable                                             
  mutable_pointer_immutable_char = imutable_pointer_mutable_char;
  printf("%s vs %s\n", mutable_pointer_immutable_char, imutable_pointer_mutable_char);
  should_also_be_mutable_pointer_immutable_char = imutable_pointer_mutable_char;
  printf("%s vs %s vs %s\n", mutable_pointer_immutable_char, imutable_pointer_mutable_char, should_also_be_mutable_pointer_immutable_char);
  return 0;
}



/* hello vs byebye */
/* hello vs Xyebye */
/* Xyebye vs Xyebye */