[SOLVED] The program has unexpectedly finished. Exited with code 0

[Renn]

I want to ask. I try correction code below:

MVC3.pro
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = MVC3
TEMPLATE = app

SOURCES += main.cpp
view.cpp
model.cpp
controller.cpp

HEADERS += view.h
model.h
controller.h

FORMS += view.ui

controller.h
#ifndef CONTROLLER_H
#define CONTROLLER_H
#include "model.h"
#include "view.h"
#include <QDebug>

class Model;
class View;

class Controller
{
public:
Controller(Model* m);
~Controller();

void OnreceiveData(View* v);

private:
Model* model;
};

#endif // CONTROLLER_H

model.h
#ifndef MODEL_H
#define MODEL_H
#include <QtGui>
#include <QtCore>
#include "controller.h"

class Controller;
class Model
{
public:
Model();
~Model();
QStringList getValueAngka();
void getValue();
QStringList hasil;

private:
int r;
int e;
};

#endif // MODEL_H

view.h
#ifndef VIEW_H
#define VIEW_H

#include <QMainWindow>
#include "controller.h"

namespace Ui {
class View;
}

class Controller;

class View : public QMainWindow
{
Q_OBJECT

public:
explicit View(QWidget parent = 0);
~View();
void setController(Controller c);

QString getAngka1();

QString getAngka2();

void setHasil(QStringList n);

public slots:
void receiveData();

private:
Ui::View *ui;

Controller*  controller;

QString angka1;

QString angka2;

};

#endif // VIEW_H

controller.cpp
#include "controller.h"
#include "model.h"
#include "view.h"
#include <QDebug>

Controller::Controller(Model *m):model(m){}
Controller::~Controller(){}

void Controller::OnreceiveData(View *v)
{
//QString angka1 = v->getAngka1();
//QString angka2 = v->getAngka2();
model->getValue();
//model->getValue();
//model->getValue(angka1.toInt(), angka2.toInt());
v->setHasil(model->getValueAngka());
}

main.cpp
#include "view.h"
#include "model.h"
#include "controller.h"

#include <QApplication>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Model model;
View window;
Controller ctrl(&model);

window.setController(&ctrl);
window.show();
return app.exec();

}

model.cpp
#include "model.h"

Model::Model() {}
Model::~Model(){}

void Model::getValue()
{
hasil << "1";
// r = 1;
// e = 3;
// hasil = r + e;
}

QStringList Model::getValueAngka()
{
return hasil;
}

view.cpp
#include "view.h"
#include "ui_view.h"
#include "controller.h"
#include <QDebug>

void View::setController(Controller *c)
{
controller = c;
}

View::View(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::View)
{
ui->setupUi(this);
controller->OnreceiveData(this);
ui->input1->setPlaceholderText("Masukkan input pertama");
ui->input2->setPlaceholderText("Masukkan input kedua");
connect(ui->hitungBtn, SIGNAL(clicked()), this, SLOT(receiveData())); // Mengirim value ke Controller melalui Button
}

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

QString View::getAngka1()
{
return ui->input1->text();
}

QString View::getAngka2()
{
return ui->input2->text();
}

void View::setHasil(QStringList n)
{
ui->hasiils->setText(n.at(0));
qDebug() << n;
}

void View::receiveData()
{
controller->OnreceiveData(this);
}

Is there something wrong with my code until the notification "The program has unexpectedly finished."

[jsulm]

Here you do not check whether the list is empty or not:

void View::setHasil(QStringList n)
{
ui->hasiils->setText(n.at(0));
qDebug() << n;
}

Another issue is - controller is not initialized when you call it in the constructor:

void View::setController(Controller *c)
{
controller = c; // Initialization here
}

View::View(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::View)
{
ui->setupUi(this);
controller->OnreceiveData(this); // Here you dereference uninitialized pointer!
ui->input1->setPlaceholderText("Masukkan input pertama");
ui->input2->setPlaceholderText("Masukkan input kedua");
connect(ui->hitungBtn, SIGNAL(clicked()), this, SLOT(receiveData())); // Mengirim value ke Controller melalui Button
}

[Renn]

@jsulm So what should I improve on my code?

[Renn]

@jsulm However, if for example I turn off this command controller->Onthereceivedata(this); can walk, just to function in button only.

[jsulm]

@Renn Well, I already told you what you should improve:

void View::setHasil(QStringList n)
{
if (n.size() > 0) // Do not call n.at(0) if n is empty!
    ui->hasiils->setText(n.at(0));
qDebug() << n;
}

Either do not call controller->OnreceiveData(this); in View::View(QWidget *parent) or make sure controller is already initialized (you can pass pointer to controller to your View constructor, then you do not need View::setController(Controller *c)).

[Renn]

@jsulm I do not know what you mean.

[jsulm]

View::View(Controller *controller, QWidget *parent) :
QMainWindow(parent),
ui(new Ui::View)
{
ui->setupUi(this);
this->controller = controller;
this->controller->OnreceiveData(this);
ui->input1->setPlaceholderText("Masukkan input pertama");
ui->input2->setPlaceholderText("Masukkan input kedua");
connect(ui->hitungBtn, SIGNAL(clicked()), this, SLOT(receiveData())); // Mengirim value ke Controller melalui Button
}

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Model model;
Controller ctrl(&model);
View window(&ctrl);

window.show();
return app.exec();
}

[Renn]

@jsulm Thank you very much for helping me.

[jsulm]

No problem