TicTacToe, Qt Desktop, Connecting radio buttons

[Asus_G72GX]

Good evening dear Qtccentre.org programmers!

I am currently in the very early stage of creating tic tac toe game for desktop. I have already created my form, placed buttons on it. But I have no idea how to connect two radiobuttons for my game.
Here is a screenshot of my game:


The main idea of it, when users selects the X radio button and clicks to buttons, text "X" should be appear on buttons, and when user select O radio button, text "O" should appear on buttons. I'v tried to use if(rado2->isChecked()) but programm crashes. Please help me to connect this two radiobuttons, so that labels ("X" or "O") could correctly adds to my buttons. Great thanks!

My code:
widget.h

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QtGui>
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    Widget(QWidget *parent = 0);
    ~Widget();
 
   QGridLayout *grid;
   QPushButton *btn1,*btn2, *btn3, *btn4, *btn5, *btn6, *btn7, *btn8, *btn9;
   QLabel *xplayer, *oplayer;
   QRadioButton *radx1, *rado2;
   QLabel *result;
 
 
public slots:
void btn1Slot();
void btn2Slot();
void btn3Slot();
 
void btn4Slot();
void btn5Slot();
void btn6Slot();
 
void btn7Slot();
void btn8Slot();
void btn9Slot();
 
void btn1oSlot();
void btn2oSlot();
void btn3oSlot();
 
void btn4oSlot();
void btn5oSlot();
void btn6oSlot();
 
void btn7oSlot();
void btn8oSlot();
void btn9oSlot();
 
};
 
#endif // WIDGET_H

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui>

class Widget : public QWidget
{
    Q_OBJECT

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

   QGridLayout *grid;
   QPushButton *btn1,*btn2, *btn3, *btn4, *btn5, *btn6, *btn7, *btn8, *btn9;
   QLabel *xplayer, *oplayer;
   QRadioButton *radx1, *rado2;
   QLabel *result;


public slots:
void btn1Slot();
void btn2Slot();
void btn3Slot();

void btn4Slot();
void btn5Slot();
void btn6Slot();

void btn7Slot();
void btn8Slot();
void btn9Slot();

void btn1oSlot();
void btn2oSlot();
void btn3oSlot();

void btn4oSlot();
void btn5oSlot();
void btn6oSlot();

void btn7oSlot();
void btn8oSlot();
void btn9oSlot();

};

#endif // WIDGET_H

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main.cpp

#include <QtGui/QApplication>
#include "widget.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include "widget.h"

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

    return a.exec();
}

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widget.cpp

#include "widget.h"
 
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    grid= new QGridLayout;
    btn1= new QPushButton;
    btn2= new QPushButton;
    btn3= new QPushButton;
    btn4= new QPushButton;
    btn5= new QPushButton;
    btn6= new QPushButton;
    btn7= new QPushButton;
    btn8= new QPushButton;
    btn9= new QPushButton;
    xplayer =new QLabel;
    radx1= new QRadioButton;
    oplayer=new QLabel;
    rado2= new QRadioButton;
    result= new QLabel;
 
    xplayer->setText("X");
    oplayer->setText("O");
 
    grid->addWidget(btn1, 0,1);
    grid->addWidget(btn2, 0,2);
    grid->addWidget(btn3,0,3);
    grid->addWidget(btn4,1,1);
    grid->addWidget(btn5,1,2);
    grid->addWidget(btn6,1,3);
    grid->addWidget(btn7,2,1);
    grid->addWidget(btn8,2,2);
    grid->addWidget(btn9,2,3);
 
    grid->addWidget(xplayer, 3,1);
    grid->addWidget(radx1,3,2);
 
    grid->addWidget(oplayer, 4,1);
    grid->addWidget(rado2,4,2);
    grid->addWidget(result,5,1);
 
 
 
    connect(btn1, SIGNAL(clicked(bool)), this, SLOT(btn1Slot()));
    connect(btn2, SIGNAL(clicked(bool)), this, SLOT(btn2Slot()));
    connect(btn3, SIGNAL(clicked(bool)), this, SLOT(btn3Slot()));
 
    connect(btn4, SIGNAL(clicked(bool)), this, SLOT(btn4Slot()));
    connect(btn5, SIGNAL(clicked(bool)), this, SLOT(btn5Slot()));
    connect(btn6, SIGNAL(clicked(bool)), this, SLOT(btn6Slot()));
 
    connect(btn7, SIGNAL(clicked(bool)), this, SLOT(btn7Slot()));
    connect(btn8, SIGNAL(clicked(bool)), this, SLOT(btn8Slot()));
    connect(btn9, SIGNAL(clicked(bool)), this, SLOT(btn9Slot()));
 
    connect(btn1, SIGNAL(clicked(bool)), this, SLOT(btn1oSlot()));
    connect(btn2, SIGNAL(clicked(bool)), this, SLOT(btn2oSlot()));
    connect(btn3, SIGNAL(clicked(bool)), this, SLOT(btn3oSlot()));
 
    connect(btn4, SIGNAL(clicked(bool)), this, SLOT(btn4oSlot()));
    connect(btn5, SIGNAL(clicked(bool)), this, SLOT(btn5oSlot()));
    connect(btn6, SIGNAL(clicked(bool)), this, SLOT(btn6oSlot()));
 
    connect(btn7, SIGNAL(clicked(bool)), this, SLOT(btn7oSlot()));
    connect(btn8, SIGNAL(clicked(bool)), this, SLOT(btn8oSlot()));
    connect(btn9, SIGNAL(clicked(bool)), this, SLOT(btn9oSlot()));
 
    setLayout(grid);
 
}
 
Widget::~Widget()
{
}
 
void Widget::btn1Slot()
{
btn1->setText("X");
 
}
 
 
void Widget::btn2Slot()
{
btn2->setText("X");
 
}
 
void Widget::btn3Slot()
{
btn3->setText("X");
 
}
 
void Widget::btn4Slot()
{
btn4->setText("X");
 
}
 
void Widget::btn5Slot()
{
btn5->setText("X");
 
}
 
void Widget::btn6Slot()
{
btn6->setText("X");
 
}
 
void Widget::btn7Slot()
{
btn7->setText("X");
 
}
 
void Widget::btn8Slot()
{
btn8->setText("X");
 
}
 
void Widget::btn9Slot()
{
btn9->setText("X");
 
}
 
 
void Widget::btn1oSlot()
{
btn1->setText("O");
 
}
 
 
void Widget::btn2oSlot()
{
btn2->setText("O");
 
}
 
 
void Widget::btn3oSlot()
{
btn3->setText("O");
 
}
 
 
void Widget::btn4oSlot()
{
btn4->setText("O");
 
}
 
 
 
void Widget::btn5oSlot()
{
btn5->setText("O");
 
}
 
 
void Widget::btn6oSlot()
{
btn6->setText("O");
 
}
 
 
 
void Widget::btn7oSlot()
{
btn7->setText("O");
 
}
 
 
 
void Widget::btn8oSlot()
{
btn8->setText("O");
 
}
 
 
void Widget::btn9oSlot()
{
btn9->setText("O");
}

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    grid= new QGridLayout;
    btn1= new QPushButton;
    btn2= new QPushButton;
    btn3= new QPushButton;
    btn4= new QPushButton;
    btn5= new QPushButton;
    btn6= new QPushButton;
    btn7= new QPushButton;
    btn8= new QPushButton;
    btn9= new QPushButton;
    xplayer =new QLabel;
    radx1= new QRadioButton;
    oplayer=new QLabel;
    rado2= new QRadioButton;
    result= new QLabel;

    xplayer->setText("X");
    oplayer->setText("O");

    grid->addWidget(btn1, 0,1);
    grid->addWidget(btn2, 0,2);
    grid->addWidget(btn3,0,3);
    grid->addWidget(btn4,1,1);
    grid->addWidget(btn5,1,2);
    grid->addWidget(btn6,1,3);
    grid->addWidget(btn7,2,1);
    grid->addWidget(btn8,2,2);
    grid->addWidget(btn9,2,3);

    grid->addWidget(xplayer, 3,1);
    grid->addWidget(radx1,3,2);

    grid->addWidget(oplayer, 4,1);
    grid->addWidget(rado2,4,2);
    grid->addWidget(result,5,1);



    connect(btn1, SIGNAL(clicked(bool)), this, SLOT(btn1Slot()));
    connect(btn2, SIGNAL(clicked(bool)), this, SLOT(btn2Slot()));
    connect(btn3, SIGNAL(clicked(bool)), this, SLOT(btn3Slot()));

    connect(btn4, SIGNAL(clicked(bool)), this, SLOT(btn4Slot()));
    connect(btn5, SIGNAL(clicked(bool)), this, SLOT(btn5Slot()));
    connect(btn6, SIGNAL(clicked(bool)), this, SLOT(btn6Slot()));

    connect(btn7, SIGNAL(clicked(bool)), this, SLOT(btn7Slot()));
    connect(btn8, SIGNAL(clicked(bool)), this, SLOT(btn8Slot()));
    connect(btn9, SIGNAL(clicked(bool)), this, SLOT(btn9Slot()));

    connect(btn1, SIGNAL(clicked(bool)), this, SLOT(btn1oSlot()));
    connect(btn2, SIGNAL(clicked(bool)), this, SLOT(btn2oSlot()));
    connect(btn3, SIGNAL(clicked(bool)), this, SLOT(btn3oSlot()));

    connect(btn4, SIGNAL(clicked(bool)), this, SLOT(btn4oSlot()));
    connect(btn5, SIGNAL(clicked(bool)), this, SLOT(btn5oSlot()));
    connect(btn6, SIGNAL(clicked(bool)), this, SLOT(btn6oSlot()));

    connect(btn7, SIGNAL(clicked(bool)), this, SLOT(btn7oSlot()));
    connect(btn8, SIGNAL(clicked(bool)), this, SLOT(btn8oSlot()));
    connect(btn9, SIGNAL(clicked(bool)), this, SLOT(btn9oSlot()));

    setLayout(grid);

}

Widget::~Widget()
{
}

void Widget::btn1Slot()
{
btn1->setText("X");

}


void Widget::btn2Slot()
{
btn2->setText("X");

}

void Widget::btn3Slot()
{
btn3->setText("X");

}

void Widget::btn4Slot()
{
btn4->setText("X");

}

void Widget::btn5Slot()
{
btn5->setText("X");

}

void Widget::btn6Slot()
{
btn6->setText("X");

}

void Widget::btn7Slot()
{
btn7->setText("X");

}

void Widget::btn8Slot()
{
btn8->setText("X");

}

void Widget::btn9Slot()
{
btn9->setText("X");

}


void Widget::btn1oSlot()
{
btn1->setText("O");

}


void Widget::btn2oSlot()
{
btn2->setText("O");

}


void Widget::btn3oSlot()
{
btn3->setText("O");

}


void Widget::btn4oSlot()
{
btn4->setText("O");

}



void Widget::btn5oSlot()
{
btn5->setText("O");

}


void Widget::btn6oSlot()
{
btn6->setText("O");

}



void Widget::btn7oSlot()
{
btn7->setText("O");

}



void Widget::btn8oSlot()
{
btn8->setText("O");

}


void Widget::btn9oSlot()
{
btn9->setText("O");
}

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