String result = exp.getName() + "(";
String result = "Math." + exp.getName() + "(";
    public Object visitExprFunCall(ExprFunCall exp)    {        String result = exp.getName() + "(";        boolean first = true;        for (Iterator iter = exp.getParams().iterator(); iter.hasNext(); )        {            Expression param = (Expression)iter.next();            if (!first) result += ", ";            first = false;            result += (String)param.accept(this);        }        result += ")";        return result;    }