justhomework/SoftwareDesign/Code/2-1/mainwindow.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::on_cal_clicked()
{
    int a = ui->num1->value();
    int b = ui->num2->value();
    ui->answer->setText(QString::number(a+b));

}