Rename filtered files in directory with Qt

/**
 * Prakash Manandhar, http://p-manandhar.info
 * Rename all *4.a files in a directory to add a d before the 4.
 */
#include <QtCore>
#include <QtGui>
 
int main (int argc, char ** argv)
{
    char * path;
    if (argc == 1) path = ".";
    else path = argv[1];
    QDir dir (path);
    QStringList filters ("*4.a");
    QFileInfoList list = dir.entryInfoList (filters);
    for (int i = 0; i < list.size(); ++i) {
            QFileInfo fInfo = list.at(i);
            QString fPath = fInfo.absoluteFilePath();
            qDebug() << fPath;
            QFile file (fPath);
            QString fPath_ren = fPath;
            fPath_ren.chop(3);
            fPath_ren += "d4.a";
            dir.rename(fPath, fPath_ren);
    }
    return 0;
}