float work1(int i)
{
      return 1.0 * i;
}
float work2(int i)
{
      return 2.0 * i;
}
void atomic_example(float *x, float *y, int *index, int n)
{
  int i;
  #pragma omp parallel for shared(x, y, index, n)
  for (i=0; i<n; i++) {
  #pragma omp atomic update
      x[index[i]] += work1(i);
      y[i] += work2(i);
  }
}
int main()
{
  float x[1000000];
  float y[10000000];
  int index[10000000];
  int i;
  for (i = 0; i < 10000000; i++) {
       index[i] = i % 1000000;
       y[i]=0.0;
  }
  for (i = 0; i < 1000000; i++) x[i] = 0.0;
  atomic_example(x, y, index, 10000000);
return 0;
}