Thread: Linked lists; getting the current elements next element

and the only reason i put

Code:

printf("\n%f %f\n", start->numberone, start->numbertwo);

inside the if statement, was to specifically debug the formula. If i chuck the above inside where the formula is the last element is skipped that is why it does not equal 183.

Code:

 printf("\n%f %f\n", start->numberone, start->numbertwo);

There wouldnt be anything there anyway.

Yep. You suggested that i put the numberone and numbertwo print outs out of the if statement, which worked but start->next != NULL stops the formula from getting the last element in the linked list.

Where did you get the final result of 183? Just wondering. If you have 174 before adding the last element. Can you explain how it itll get 183 from statring here(174)??

Code:

double test = 0;
      test += sqrt( ( pow( (28.80 - 5.60), 2) + pow( (17.60 - 79.12), 2) ));
        test += sqrt( ( pow( (5.60 - 55.30), 2) + pow( (79.12 -  49.90), 2) ));
      test += sqrt( ( pow( (55.30 -  22.22), 2) + pow( (49.90 -   11.11), 2) ));

= 174.382311


## test += sqrt( ( pow( (22.22 - 28.80), 2) + pow( (11.11 -  17.60), 2) ));

## which is the skipped element

makes it 183.624415

I hope this would be the solution

Code:

void printList(charNode *start)
{
   float total;
   float x1, x2;
   charNode *fElement = start;

   while (start != NULL )
   {
      x1 = fElement->numberone;
      x2 = fElement->numbertwo;
      
      if (start->next != NULL){
         x1 = start->next->numberone;
         x2 = start->next->numbertwo;
      } 
      
      printf("\n%f %f\n", start->numberone, start->numbertwo);
      total += sqrt( ( pow( (start->numberone - x1), 2) + pow( (start->numbertwo - x2 ), 2) ));
         
      start = start->next;

    printf("%s %.2f", "\nTotal is now ", total);

   }
}

The problem aint the last term being skipped. If you explained that your having a problem with your total it would have been solved earlier. It got really far from the real problem

yes it does, thanks! I'm just curious however, if the last element in my original code wasn't being skipped then why was nothing being printed when it got to the last element? and it was working if it was placed before the if (start->next != null statement.

Which original code??

this one?

Code:

while (start != NULL)
{
    printf("\n%f %f\n", start->numberone, start->numbertwo);
    printf("%s %.2f %.2f %s", "next element is -+> ", start->next->numberone, start->next->numbertwo, "**OK**");
    start = start->next;
}

Edited*

The problem i see with you is that. You probably have a wrong picture of how your list really look like.

no this one:

Code:

    while (start != NULL )
   {

      printf("\n%f %f\n", start->numberone, start->numbertwo);

      if (start->next != NULL)
      {
         total += sqrt( ( pow( (start->numberone - start->next->numberone), 2) + pow( (start->numbertwo - start->next->numbertwo), 2) ));
      }
      start = start->next;

    printf("%s %.2f", "\nTotal is now ", total);

   }

when the following line:

printf("\n%f %f\n", start->numberone, start->numbertwo);

is placed inside the if statement it skips the last element. But it does not in the while loop.