#include <omp.h>
#include <stdio.h>

int main (int argc, char *argv[])
{
    int nthreads, thread_id;

    #pragma omp parallel private(nthreads, thread_id)
    {
        thread_id = omp_get_thread_num();
        printf("Thread %d says: Hello World\n", thread_id);

        if (thread_id == 0)
        {
            nthreads = omp_get_num_threads();
            printf("Thread %d reports: the number of threads are %d\n", 
                thread_id, nthreads);
        }
    }

    return 0;
}