怎么才能简化代码方法

Question

void MainWindow::surveyData()
{
    int math=0, chinese=0, english=0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem *aItem= theModel->item(i, 1);
        int text = aItem->text().toInt();
        if (text < 60)
            math++;
    }
    QString Math = QString::number(math);
    math = 0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 2);
        int text = aItem->text().toInt();
        if (text < 60)
            chinese++;
    }
    QString Chinese = QString::number(chinese);
    chinese = 0;

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 3);
        int text = aItem->text().toInt();
        if (text < 60)
            english++;
    }
    QString English = QString::number(english);
    english = 0;


    QStringList headerList;
    headerList << "     分数段" << "数学" <<"语文"<< "英语";
    ui.treeWidget->setHeaderLabels(headerList);
    QTreeWidgetItem* item;
    item = new QTreeWidgetItem(1001);
    item->setText(0, "60分以下");
    item->setText(1, Math);
    item->setText(2, Chinese);
    item->setText(3, English);
    ui.treeWidget->addTopLevelItem (item);

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 1);
        int text = aItem->text().toInt();
        if (text > 60&&text<69)
            math++;
    }
    QString Math1 = QString::number(math);
    math = 0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 2);
        int text = aItem->text().toInt();
        if (text > 60&&text<69)
            chinese++;
    }
    QString Chinese1 = QString::number(chinese);
    chinese = 0;

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 3);
        int text = aItem->text().toInt();
        if (text > 60&&text<69)
            english++;
    }
    QString English1 = QString::number(english);
    english = 0;
    item = new QTreeWidgetItem(1002);
    item->setText(0, "60-69分");
    item->setText(1, Math1);
    item->setText(2, Chinese1);
    item->setText(3, English1);
    ui.treeWidget->addTopLevelItem(item);

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 1);
        int text = aItem->text().toInt();
        if (text > 70 && text < 79)
            math++;
    }
    QString Math2 = QString::number(math);
    math = 0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 2);
        int text = aItem->text().toInt();
        if (text > 70 && text < 79)
            chinese++;
    }
    QString Chinese2 = QString::number(chinese);
    chinese = 0;

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 3);
        int text = aItem->text().toInt();
        if (text > 70 && text < 79)
            english++;
    }
    QString English2 = QString::number(english);
    english = 0;
    item = new QTreeWidgetItem(1003);
    item->setText(0, "70-79分");
    item->setText(1, Math2);
    item->setText(2, Chinese2);
    item->setText(3, English2);
    ui.treeWidget->addTopLevelItem(item);

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 1);
        int text = aItem->text().toInt();
        if (text > 80 && text < 89)
            math++;
    }
    QString Math3 = QString::number(math);
    math = 0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 2);
        int text = aItem->text().toInt();
        if (text > 80 && text < 89)
            chinese++;
    }
    QString Chinese3 = QString::number(chinese);
    chinese = 0;

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 3);
        int text = aItem->text().toInt();
        if (text > 80 && text < 89)
            english++;
    }
    QString English3 = QString::number(english);
    english = 0;
    item = new QTreeWidgetItem(1004);
    item->setText(0, "80-89分");
    item->setText(1, Math3);
    item->setText(2, Chinese3);
    item->setText(3, English3);
    ui.treeWidget->addTopLevelItem(item);

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 1);
        int text = aItem->text().toInt();
        if (text > 90)
            math++;
    }
    QString Math4 = QString::number(math);
    math = 0;
    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 2);
        int text = aItem->text().toInt();
        if (text > 90)
            chinese++;
    }
    QString Chinese4 = QString::number(chinese);
    chinese = 0;

    for (int i = 0; i < iniDataRowCount; i++)
    {
        QStandardItem* aItem = theModel->item(i, 3);
        int text = aItem->text().toInt();
        if (text > 90)
            english++;
    }
    QString English4 = QString::number(english);
    english = 0;
    item = new QTreeWidgetItem(1005);
    item->setText(0, "90分以上");
    item->setText(1, Math4);
    item->setText(2, Chinese4);
    item->setText(3, English4);
    ui.treeWidget->addTopLevelItem(item);
}
大佬们，这个代码有办法简化吗？

Answer 1

目测可以提炼出函数，避免重复编写。