/********************************************************
*** Switch to bash Shell if you are not already there. ***
bash-4.1$ gcc -fopenmp -Wall -Werror example1OMP.c -o a.out
bash-4.1$ export  OMP_NUM_THREADS=10 (For tcsh setenv OMP_NUM_THREADS 10)
bash-4.1$ ./a.out
Hello World from thread = 6
Hello World from thread = 1
Hello World from thread = 9
Hello World from thread = 2
Hello World from thread = 3
Hello World from thread = 4
Hello World from thread = 5
Hello World from thread = 7
Hello World from thread = 8
Hello World from thread = 0
Number of threads = 10
**********************************************************/
#include <stdio.h>
#include <omp.h>

int main () {
    int nthreads, tid;
    /* Fork a team of threads giving them their own copies of variables */
    #pragma omp parallel private(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);
        }
    } 	/* End of parallel section. All Thread join master thread and terminate */
		/* Implicit barrier at the end of the parallel region */
	return 0;
}