void MainWindow::on_ZapisA_clicked()
{
    QString fileName = QFileDialog::getSaveFileName(this,"","", tr("txt files (*.txt);;All Files (*)"));
    QFile file (fileName);
    QTextEdit* a[9] = {ui->a_0, ui->a_1, ui->a_2, ui->a_3, ui->a_4, ui->a_5, ui->a_6, ui->a_7, ui->a_8};
    if (!file.open(QFile::WriteOnly)){

    }
    else{
        for(int i = 0; i <= 8; i++){
            if(a[i]->toPlainText()!=""){
                file.write(a[i]->toPlainText().toUtf8()+";");
            }else{
                file.write("0;");
            }
            if(i==2 || i==5){
                file.write("\n");
            }
        }
    }
    file.close();
}