/*
 
 This program provides several examples of incorrect 
 operations on pointers. Try to compile and run the 
 program as is. Note that the compiler will return 
 several warnings and errors. You should make sure 
 to identify the reasons for these.
 
 Next, try commenting out the code that has errors 
 (not the warnings), then recompile and run the 
 program. You should notice that the program fails 
 and produces a segmentation fault (a catastrophic 
 failure!). Look at the code that produced warnings 
 to understand what code is causing this and why. 
 You can try commenting out all the code that 
 produces warnings and re-enabling it one line at a 
 time.
 
 */
#include <stdio.h>

int main(void)
{
   int a, b, *p1, *p2;
   a = 30;
   b = 50;
   p1 = &a;
   p2 = &b;

   printf("%d %d %d %d %d %d\n", a, b, *p1, *p2, p1, p2);

   p1 = &35;

   p1 = *35;

   p1 = 35;

   a = &b;

   a = *b;

   *a = *p1;

   &p1 = p2;

   a = p2;

   a = **p2;

   p1 = b;

   p1 = &p2;

   p1 = *p2;

   a = *b;

   *p1 = p2;

   *p1 = &a;

   return 0;
}