#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::on_pushButton_clicked()
{
    int iA1 = ui->lineEdit->text().toInt();
    int iD = ui->lineEdit_2->text().toInt();
    int iN = ui->lineEdit_3->text().toInt();
    if (iA1 == NULL || iD == NULL || iN == NULL)
    {
        ui->label_4->setText("Incorrect value");
        return;
    }
    int iResultOne = iA1 + iD * ( iN -1 );
    QString sResultOne = QString::number(iResultOne);
    ui->label_4->setText(sResultOne);

    int iResultTwo = (iA1 + iResultOne) / 2 * iN;
    QString sResultTwo = QString::number(iResultTwo);
    ui->label_5->setText(sResultTwo);

}