void MainWindow::on_pushButton_clicked()
{

 int boy = ui->lineEdit->text().toInt();
 int kilo = ui->lineEdit_2->text().toInt();

    qDebug() << "boy : " << boy;
    qDebug() << "kilo : " << kilo;

    int sonuc = (boy*boy/100);
    int sonuc2 = (kilo/sonuc)*100;


    ui->label_4->setText(QString::number(sonuc2));

}