i = stof(db_get(rpn_db, "stack.pointer"));
db_put(rpn_db, "stack.pointer", ftos(i+1));
db_put(rpn_db, strcat("stack.", ftos(i)), s);
i = stof(db_get(rpn_db, "stack.pointer"));
db_put(rpn_db, "stack.pointer", ftos(i+1));
db_put(rpn_db, strcat("stack.", ftos(i)), s);