Math with Qt

Abderaouf

Gents;

I have been working on adding two numbers using 2 Qlinedits and displaying the result on a Qlabel using a Qpushbutton. Once launched the .exe file crashes and shows no result: please find below my code for review, your advices are welcome.

Cheers.

my .h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QSpinBox>
#include <QLabel>
#include <QLineEdit>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

    void valueChanged (QString resultat);

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
QLineEdit *Input1;
QLineEdit *Input2;
QLabel *resultat;
};

#endif // MAINWINDOW_H

my .cpp

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

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

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

void MainWindow::valueChanged(QString)
{

    ui->resultat->setText(QString::number(Input1->text().toInt() + Input2->text().toInt()));

}
void MainWindow::on_pushButton_clicked()
{
   valueChanged("resultat");
}

? Offline

Hi! Input1 and Input2 point to nothing.

koahnig

@Abderaouf

Added code tags to your post.
Wieland was faster to answer

raven-worx

@Abderaouf
the variables Input1 and Input2 are never initialized, but you are accessing them.
I guess you want the input fields from your ui file no?
You should access them with ui->Input1

Abderaouf

Thank you guys and lady. That was reallly helpful.