myIterator

#include <QtCore/QCoreApplication>#include <QList>#include <QDebug>int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QList<QString> list;    list << "A" << "B" <<"C" << "D";    QList<QString>::iterator i;    qDebug() << "the forward is :";    for (i=list.begin(); i!=list.end();++i){        *i=(*i).toLower();        qDebug() << *i;    }    qDebug() << "the backward is :";    while(i!=list.begin()){        --i;        qDebug() << *i;    }    QList<QString>::const_iterator j;    qDebug() << "the forward is:";    for(j=list.constBegin();        j!=list.constEnd();        ++j)        qDebug() << *j;    return a.exec();}