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#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    ui->pushButton->setText("Hi");
[color=red]    connect(ui->horizontalSlider,SIGNAL(valueChange(int)),
            ui->progressBar,SLOT(setValue(int)));[/color]
}

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


#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}




#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

Starting /u01/Projects/build-mainwindow-Desktop_Qt_5_3_GCC_64bit-Debug/mainwindow...
QObject::connect: No such signal QSlider::valueChange(int) in ../mainwindow/mainwindow.cpp:10
QObject::connect:  (sender name:   'horizontalSlider')
QObject::connect:  (receiver name: 'progressBar')