Changing Slider Base

[eLancaster]

I'm writing a program where you move a slider and the number on QLCDNumber changes accordingly. I want to add a couple of buttons which will change the base of the slider (from decimal base to binary/hexadecimal).
This is the code that i've written - the main line is in bold.
The program compiles - but when I click on the button, the base doesn't change.
What's wrong here?

QLCDNumber *lcd=new QLCDNumber(3,this);
    lcd->setMode(QLCDNumber::Dec);
    lcd->setGeometry(50,25,100,100);
 
    QSlider *slide = new QSlider(Qt::Horizontal,this);
    slide->setRange(0,100);
    slide->setValue(0);
    slide->setGeometry(50,125,100,25);
 
    connect(slide,SIGNAL(sliderMoved(int)),lcd,SLOT(display(int)));
 
    QPushButton *hex = new QPushButton("Hexadecimal",this);
    hex->setFont(QFont("Times",12));
    hex->setGeometry(50,200,100,25);
 
    [B]connect(hex,SIGNAL(clicked()),lcd,SLOT(setMode(QLCDNumber::Hex)));[/B]

QLCDNumber *lcd=new QLCDNumber(3,this);
    lcd->setMode(QLCDNumber::Dec);
    lcd->setGeometry(50,25,100,100);

    QSlider *slide = new QSlider(Qt::Horizontal,this);
    slide->setRange(0,100);
    slide->setValue(0);
    slide->setGeometry(50,125,100,25);

    connect(slide,SIGNAL(sliderMoved(int)),lcd,SLOT(display(int)));

    QPushButton *hex = new QPushButton("Hexadecimal",this);
    hex->setFont(QFont("Times",12));
    hex->setGeometry(50,200,100,25);

    [B]connect(hex,SIGNAL(clicked()),lcd,SLOT(setMode(QLCDNumber::Hex)));[/B]

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