Invalid operands to binary in my 'NumberSize' function

Question

I have created a function that is supposed to take the numbers in my linked list and determine which one is the smallest number and which one is the largest number. I created a

Answer 1

You forgot to step through the list. Using on of the solutions for the average:

void NumberSize(NewNumber * start)
{
  double num = 0.0;

  double biggest;
  double smallest;
  int flag = 0;

  NewNumber *temp = start;
  // set start values
  if(tmp != NULL){
     biggest = temp->newNum;
     smallest = temp->newNum;
     tmp = tmp->next;
     flag = 1;
  }

  // while temp is not NULL
  while (temp) {
    // get number from current node
    num = temp->newNum;
    // if that number is bigger than "biggest"
    if (num > biggest) {
      // exchange "biggest" with "num"
      biggest = num;
    }
    // do it the same way for the smallest number
    else if (num < smallest) {
      smallest = num;
    }
    // here is the forgotten line:
    // go to the next node
    temp = temp->next;
  }
  if(flag){
    // no returns, just printing
    printf("The smallest number is: \n", smallest);
    printf("The biggest number is: \n", biggest);
  } else {
    puts("list empty");
  }
}