Write a Program in C That Attempting To Modify a Constant Pointer To Constant Data

// Attempting to modify a constant pointer to constant data.

#include <stdio.h>

int main( void )

{

   int x = 5; // initialize x

   int y; // define y

   // ptr is a constant pointer to a constant integer. ptr always 

   // points to the same location; the integer at that location

   // cannot be modified

   const int *const ptr = &x; // initialization is OK

                                 

   printf( "%d\n", *ptr );

   *ptr = 7; // error: *ptr is const; cannot assign new value 

   ptr = &y; // error: ptr is const; cannot assign new address

} // end main