code: public void alias( double value , String name ) {
          if( isReserved(name))
              throw new RuntimeException("Reserved word or contains a reserved character. '"+name+"'");
  
          VariableDouble old = (VariableDouble)variables.get(name);
          if( old == null ) {
              variables.put(name, new VariableDouble(value));
          }else {
              old.value = value;
          }
      }
docs: Adds a new floating point variable. If one already has the same name it is written over.
  @param value Value of the number
  @param name Name in code