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

int main(argc,argv)
{
int nthreads, tid; 

/* Fork a team of threads with each thread having a private tid variable */ 
#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); 
    } 
  }  /* All threads join master thread and terminate */ 

}