endl' was not declared in this scope

[k.qasempour]

whats the problem here... it makes me angryy!!!!
i face with this error

" 'endl' was not declared in this scope"

here is the code

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <iostream>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
 
    QFile myFile("c://Victory.txt");
    myFile.open(QIODevice::Append);
    QDataStream ds(&myFile);
 
    ds<<"bbbb/n"<<endl;
 
    myFile.close();
 
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <iostream>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{

    QFile myFile("c://Victory.txt");
    myFile.open(QIODevice::Append);
    QDataStream ds(&myFile);

    ds<<"bbbb/n"<<endl;

    myFile.close();

}

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