#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
#define N 50

int main (int argc, char *argv[]) {
	int i, nthreads, tid;
	float a[N], b[N], c[N], d[N];

	for (i=0; i<N; i++) {	// Some initializations, arbitrary values
  		a[i] = i * 1.5;
  		b[i] = i + 22.35;
  		c[i] = d[i] = 0.0;
  	}

	#pragma omp parallel shared(a,b,c,d,nthreads) private(i,tid) 
	{
		tid = omp_get_thread_num();
		if (tid == 0)  {
			nthreads = omp_get_num_threads();
    		printf("Number of threads = %d\n", nthreads);
		}
  		printf("Thread %d starting...\n",tid);

 		#pragma omp sections nowait
		{
   		#pragma omp section
			{
      		printf("Thread %d doing section 1\n",tid);
      		for (i=0; i<N; i++)   {
       			c[i] = a[i] + b[i];
        			printf("Thread %d: c[%d]= %f\n",tid,i,c[i]);
        		}
     		}

    		#pragma omp section
			{
     			printf("Thread %d doing section 2\n",tid);
      		for (i=0; i<N; i++)  {
        			d[i] = a[i] * b[i];
        			printf("Thread %d: d[%d]= %f\n",tid,i,d[i]);
      		}
      	}
   	}  						// end of sections

 		printf("Thread %d done.\n",tid); 

  	}  							// end of parallel section
	return(0);
}