OpenMP parallel calculating for loop indices

Question

My parallel programming class has the program below demonstrating how to use the parallel construct in OpenMP to calculate array bounds for each thread to be use in a for loop.

#pragma omp parallel
{
  int id = omp_get_thread_num();
  int p = omp_get_num_threads();
  int start = (N * id) / p;
  int end = (N * (id + 1)) / p;
  if (id == p - 1) end = N;
  for (i = start; i < end; i++)
  {
    A[i] = x * B[i];
  }
}

My question is, is the if statement (id == p - 1) necessary? From my understanding, if id = p - 1, then end will already be N, thus the if statement is not necessary. I asked in my class's Q&A board, but wasn't able to get a proper answer that I understood. Assumptions are: N is the size of array, x is just an int, id is between 0 and p - 1.