--- trunk/OOPSE/libmdtools/Molecule.cpp	2003/07/15 15:50:55	610
+++ trunk/OOPSE/libmdtools/Molecule.cpp	2003/10/28 16:03:37	829
@@ -1,4 +1,4 @@
-#include <cstdlib>
+#include <stdlib.h>
 
 
 #include "Molecule.hpp"
@@ -198,3 +198,19 @@ double Molecule::getCOMvel( double COMvel[3] ) {
   return mtot;
 
 }
+
+double Molecule::getTotalMass()
+{
+  int natoms;
+  Atom** atoms;
+  double totalMass;
+  
+  natoms = getNAtoms();
+  atoms = getMyAtoms();
+  totalMass = 0;
+  for(int i =0; i < natoms; i++){
+    totalMass += atoms[i]->getMass();
+  }
+
+  return totalMass;
+}