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add foreach
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@leichaojian
leichaojian committed Nov 18, 2014
1 parent 925abd5 commit c149505
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18 changes: 18 additions & 0 deletions foreach/foreach.pro
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#-------------------------------------------------
#
# Project created by QtCreator 2014-11-18T19:29:36
#
#-------------------------------------------------

QT += core

QT -= gui

TARGET = foreach
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app


SOURCES += main.cpp
255 changes: 255 additions & 0 deletions foreach/foreach.pro.user
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53 changes: 53 additions & 0 deletions foreach/main.cpp
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#include <QCoreApplication>
#include <QList>
#include <iostream>
#include <vector>
using namespace std;

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QList<double> list;
list.push_back(1);
list.push_back(2);
list.push_back(3);
list.push_back(4);
list.push_front(-1);
list.push_front(-2);
list.push_front(-3);
list.push_front(-4);

//java风格
QListIterator<double> i(list);
//不用qDebug，因为其会自动换行
//向后迭代输出
while (i.hasNext()) {
cout << i.next() << " ";
}
cout << endl;
//向前迭代输出
i = list;
i.toBack();
while (i.hasPrevious()) {
cout << i.previous() << " ";
}
cout << endl;

//STL风格
//向后迭代输出
vector<double> dvec(list.begin(), list.end());
vector<double>::iterator beg = dvec.begin();
for (; beg != dvec.end(); beg++) {
cout << *beg << " ";
}
cout << endl;
//向前迭代输出
vector<double>::reverse_iterator rbeg = dvec.rbegin();
for (; rbeg != dvec.rend(); rbeg++) {
cout << *rbeg << " ";
}
cout << endl;

return a.exec();
}

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