#include <stdio.h>
#ifdef _OPENMP
  #include<omp.h>
#endif
int main() {
/*Example of sections*/
int n=7;
int a[n],ta[n],b[n],tb[n];
#pragma omp parallel shared(a,ta,b,tb,n)
{
  #pragma omp sections
  {
    #pragma omp section
    {
      int tid=0; /*Dummy thread number for the case OMP is not enabled*/
      #ifdef _OPENMP
        tid=omp_get_thread_num();
      #endif
      for (int i=0; i<n; i++) {
        a[i]=2*i;
        ta[i]=tid; /*Record which thread did which iteration*/
      }
    }
    #pragma omp section
    {
      int tid=0; /*Dummy thread number for the case OMP is not enabled*/
      #ifdef _OPENMP
        tid=omp_get_thread_num();
      #endif
      for (int i=0; i<n; i++) {
        b[i]=3*i;
        tb[i]=tid; /*Record which thread did which iteration*/
      }
    }
  }
}
/*Show what was produced*/
printf("i,a(i),thread that made a(i),b(i), thread that made b(i)\n");
for (int i=0; i<n; i++) printf("%i %i %i %i %i\n",i,a[i],ta[i],b[i],tb[i]);
return 0;
}