--- capa/capa51/pProj/capaFormula.y	2000/06/30 21:36:16	1.3
+++ capa/capa51/pProj/capaFormula.y	2000/07/07 18:33:03	1.5
@@ -14,11 +14,16 @@
    You should have received a copy of the GNU Library General Public
    License along with the CAPA system; see the file COPYING.  If not,
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   Boston, MA 02111-1307, USA.
+
+   As a special exception, you have permission to link this program
+   with the TtH/TtM library and distribute executables, as long as you
+   follow the requirements of the GNU GPL in regard to all of the
+   software in the executable aside from TtH/TtM.
+*/
 
 /* ====================================================== */
 /*      capaFormula.y  created by Isaac Tsai @ Feb 1999   */
-/*      copyrighted by Isaac Tsai    1999                 */
 /*  TODO: checking user inputs   2/27/99      IT          */
 /* ====================================================== */
 %{
@@ -211,6 +216,9 @@ f_symbol_pow(ap,bp) Symbol *ap; Symbol *
      case S_CONSTANT: 
      default:         error = 1; break;
   }
+  if ((!(((double)((int)b)) == b)) && (a < 0.0)) {
+    error = 1;
+  }
   if (!error) {
     cp = (Symbol *)capa_malloc(sizeof(Symbol),1);
     cp->s_type = R_CONSTANT;