Common Mistakes / Errors while using Pointer in C Programming

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1 . Assigning Value to Uninitialized Pointer

      int * ptr , m = 100 ;
      *ptr = m ;                 // Error on This Line 

2 . Assigning Value to Pointer Variable

      int * ptr , m = 100 ;

      ptr = m ;                 // Error on This Line 

3 . Not Dereferencing Pointer Variable

      int * ptr , m = 100 ;

      ptr =  &m ;

      printf("%d",p);     // Error on this Line

4. Assigning Address of Un-initialized Variable

      int *ptr,m;

      p = &m;     // Error on this Line

5. Comparing Pointers that point to different objects

       char str1[10],str2[10];

       char *ptr1 = str1;

       char *ptr2 = str2;

       if(ptr1>ptr2)  .....                  // Error Here 

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