Problem with slot

[stefek]

Hi!
I'm trying to develop a simple calculator. I'm using Qt Creator. I've already designed a form, but now I have a problem with slot. It calls, when i push the button with digit and adds the digit to lcd. I think everything is ok, but i get compiler's errors. Here is the source code:

//calc.h
 
#ifndef CALC_H
#define CALC_H
 
#include <QtGui/QDialog>
 
namespace Ui
{
    class Calc;
}
 
class Calc : public QDialog
{
    Q_OBJECT
 
public:
    Calc(QWidget *parent = 0);
    ~Calc();
 
slots:
    void setVal(const int &val);
 
private:
    Ui::Calc *ui;
};
 
#endif // CALC_H

//calc.h

#ifndef CALC_H
#define CALC_H

#include <QtGui/QDialog>

namespace Ui
{
    class Calc;
}

class Calc : public QDialog
{
    Q_OBJECT

public:
    Calc(QWidget *parent = 0);
    ~Calc();

slots:
    void setVal(const int &val);

private:
    Ui::Calc *ui;
};

#endif // CALC_H

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//calc.cpp
#include "calc.h"
#include "ui_calc.h"
 
Calc::Calc(QWidget *parent)
    : QDialog(parent), ui(new Ui::Calc)
{
    ui->setupUi(this);
}
 
Calc::~Calc()
{
    delete ui;
}
 
void Calc::setVal(const int &val){
 
    lcdNumber-> intValue*=10;
    lcdNumber -> intValue+=val;
}

//calc.cpp
#include "calc.h"
#include "ui_calc.h"

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

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

void Calc::setVal(const int &val){

    lcdNumber-> intValue*=10;
    lcdNumber -> intValue+=val;
}

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And these are the errors:

calc.h:16: error: expected primary-expression before ‘void’
calc.h:16: error: ISO C++ forbids declaration of ‘type name’ with no type
calc.h:16: error: expected ‘;’ before ‘void’
calc.cpp:11: error: no ‘void Calc::setVal(const int&)’ member function declared in class ‘Calc’

Please help me
Regards
Stefek