--- capa/capa51/pProj/capaUnit.c	2000/09/20 17:20:33	1.10
+++ capa/capa51/pProj/capaUnit.c	2023/08/04 18:09:55	1.14
@@ -727,22 +727,24 @@ process_op(int op)
   }
 }
 
-void
+Unit_t*
 process_utree(Unit_t *t)
 {
   Ptopidx=0;
   postwalk_utree(t);
   if( Ptopidx == 1 ) {
-    /* printf("Correctly parsed!\n"); */
-    printf("Unit:%s\n",Sbuf);
+    //fprintf(stderr,"Correctly parsed!\n");
+    //fprintf(stderr,"Unit:%s\n",Sbuf);
     simplify_unit(Pstack[Ptopidx]);
-    Pstack[Ptopidx]->u_symbol[0]='\0';
-    /*sprintf(Pstack[Ptopidx]->u_symbol,"");*/
-    print_unit_t(Pstack[Ptopidx]);
-    u_find_name(Pstack[Ptopidx]);
-    print_matches(Pstack[Ptopidx]);
-    free_utree(t);
+    //Pstack[Ptopidx]->u_symbol[0]='\0';
+    //fprintf(stderr,Pstack[Ptopidx]->u_symbol,"");
+    //print_unit_t(Pstack[Ptopidx]);
+    //u_find_name(Pstack[Ptopidx]);
+    //print_matches(Pstack[Ptopidx]);
+    return(Pstack[Ptopidx]);
+    //free_utree(t);
   }
+  return(t);
 }
 
 /* ============================================================== */
@@ -781,17 +783,17 @@ int  check_correct_unit(char *u_symb,Uni
 	  (Pstack[Ptopidx]->u_count == t->u_count) ) { /* has unit */
 	*scale = units_ratio(Pstack[Ptopidx], t);
 	if( *scale == 0.0 ) {
-	  result = UNIT_FAIL;
+	  result = UNIT_IRRECONCIBLE;
 	}
 	free_utree(ap);
       } else {
-	result = UNIT_FAIL;
+	result = UNIT_INVALID_STUDENT3;
       }
     } else { /* invalid unit representation */
-      result = UNIT_FAIL;
+      result = UNIT_INVALID_STUDENT2;
     }
   } else {
-    result = UNIT_FAIL;
+    result = UNIT_INVALID_STUDENT1;
   }
 #ifdef UNIT_DBUG
   fclose(ufp);
@@ -912,7 +914,6 @@ u_copy_unit(Unit_t *a_p, Unit_t *b_p, do
       a_p->u_count++;
     } else if( b_p->u_type == U_DERIVED) {
       /* derived units but without any units elements (scalar) */
-      /* do nothing, ignore this units  WE REALLY MEAN THIS DON'T DO THE NEXT LINE!*/
       /*a_p->u_count++;*/
       scale = pow(b_p->u_scale, exp_scale);
       a_p->u_scale = a_p->u_scale * scale;