#include <omp.h>

main ()  {

    int nthreads, tid;

    /* Check how many processors are available */

    printf("There are %d processors\n", omp_get_num_procs());

    /* Set the number of threads to 4 */
    omp_set_num_threads(4);
    

    /* Fork a team of threads giving them their own copies of variables */

#pragma omp parallel private(nthreads, tid)
    {

        /* Obtain and print thread id */
        tid = omp_get_thread_num();
        printf("Hello World from thread = %d\n", tid);


        /* Only master thread does this */
        if (tid == 0) 
            {
                nthreads = omp_get_num_threads();
                printf("Number of threads = %d\n", nthreads);
            }

    }  /* All threads join master thread and terminate */

}