refactor scatter example

exercises/MPI_examples/scatter/scatter.c

@@ -31,7 +31,7 @@ int main(int argc, char **argv) {
   MPI_Scatter(bigdata, SCATTER_NUM, MPI_INT, localdata, SCATTER_NUM, MPI_INT, 0,
               MPI_COMM_WORLD);
 
-  printf("Process %d of %d on %s: localdata[10] = {", rank, num_processes, processor_name);
+  printf("Process %d of %d on %s received: localdata[%d] = {", rank, num_processes, processor_name, SCATTER_NUM);
   for (int i = 0; i < SCATTER_NUM; i++) {
     printf("%d, ", localdata[i]);
   }