3.QT计算机实战

  • mainwindow.h 
    #ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void on_pushButton_clicked();

    void on_num1_textChanged(const QString &arg1);

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

     

  • mainwindow.cpp 
      1 #include "mainwindow.h"
  2 #include "ui_mainwindow.h"
  3 #include "op.h"
  4 #include <QDebug>
  5 
  6 MainWindow::MainWindow(QWidget *parent) :
  7     QMainWindow(parent),
  8     ui(new Ui::MainWindow)
  9 {
 10     ui->setupUi(this);
 11 }
 12 
 13 MainWindow::~MainWindow()
 14 {
 15     delete ui;
 16 }
 17 
 18 const QString op1("+");
 19 const QString op2("-");
 20 const QString op3("*");
 21 const QString op4("/");
 22 
 23 void MainWindow::on_pushButton_clicked()
 24 {
 25     qDebug()<<"hello"<<endl;
 26     op ops;
 27     bool isok;
 28     QString str1 = ui->num1->text();
 29     QString str2 = ui->op->text();
 30     QString str3 = ui->num2->text();
 31     //保存结果
 32     QString str4;
 33     int a = str1.toInt(&isok,10);
 34     int b = str3.toInt(&isok,10);
 35 
 36     ops.seta(a);
 37     ops.setb(b);
 38 
 39     if(str2 == op1)
 40     {
 41         str4.sprintf("%d",ops.add());
 42         qDebug()<<str4<<endl;
 43     }
 44     else if(str2 == op2)
 45     {
 46         str4.sprintf("%d",ops.sub());
 47         qDebug()<<str4<<endl;
 48     }
 49     else if(str2 == op3)
 50     {
 51         str4.sprintf("%d",ops.mul());
 52          qDebug()<<str4<<endl;
 53     }
 54     else if(str2 == op4)
 55     {
 56         str4.sprintf("%d",ops.divv());
 57          qDebug()<<str4<<endl;
 58     }
 59     ui->textEdit->setText(str4);
 60 }
 61 
 62 void MainWindow::run()
 63 {
 64     qDebug()<<"hello"<<endl;
 65     op ops;
 66     bool isok;
 67     QString str1 = ui->num1->text();
 68     QString str2 = ui->op->text();
 69     QString str3 = ui->num2->text();
 70     //保存结果
 71     QString str4;
 72     int a = str1.toInt(&isok,10);
 73     int b = str3.toInt(&isok,10);
 74 
 75     ops.seta(a);
 76     ops.setb(b);
 77 
 78     if(str2 == op1)
 79     {
 80         str4.sprintf("%d",ops.add());
 81         qDebug()<<str4<<endl;
 82     }
 83     else if(str2 == op2)
 84     {
 85         str4.sprintf("%d",ops.sub());
 86         qDebug()<<str4<<endl;
 87     }
 88     else if(str2 == op3)
 89     {
 90         str4.sprintf("%d",ops.mul());
 91          qDebug()<<str4<<endl;
 92     }
 93     else if(str2 == op4)
 94     {
 95         str4.sprintf("%d",ops.divv());
 96          qDebug()<<str4<<endl;
 97     }
 98     ui->textEdit->setText(str4);
 99 }
100 
101 
102 void MainWindow::on_num1_textChanged(const QString &arg1)
103 {
104     qDebug()<<"hello"<<endl;
105     op ops;
106     //父类存储子类对象的地址
107     QObject *pobj = &ops;
108 
109     bool isok;
110     QString str1 = ui->num1->text();
111     int a = str1.toInt(&isok,10);
112     if(!isok)
113     {
114         ui->num1->clear();
115     }
116 }

     

  • op.h 
     1 #ifndef OP_H
 2 #define OP_H
 3 
 4 #include <QObject>
 5 
 6 class op : public QObject
 7 {
 8     Q_OBJECT
 9 public:
10     explicit op(QObject *parent = nullptr);
11     int add();
12     int sub();
13     int mul();
14     int divv();
15 
16 public:
17     void seta(int data);
18     void setb(int data);
19     int geta();
20     int getb();
21 
22 private:
23     int a;
24     int b;
25 
26 
27 signals:
28 
29 public slots:
30 };
31 
32 #endif // OP_H

     

  • op.cpp 
     1 #include "op.h"
 2 
 3 op::op(QObject *parent) : QObject(parent)
 4 {
 5     a = b = 0;
 6 }
 7 
 8 int op::add()
 9 {
10     return a+b;
11 }
12 
13 int op::sub()
14 {
15     return a-b;
16 }
17 
18 int op::mul()
19 {
20     return a*b;
21 }
22 
23 int op::divv()
24 {
25     return a/b;
26 }
27 
28 void op::seta(int data)
29 {
30     a = data;
31 }
32 
33 void op::setb(int data)
34 {
35     b = data;
36 }
37 
38 int op::geta()
39 {
40     return a;
41 }
42 
43 int op::getb()
44 {
45     return b;
46 }

     

  • main.cpp 
     1 #include "mainwindow.h"
 2 #include <QApplication>
 3 
 4 int main(int argc, char *argv[])
 5 {
 6     QApplication a(argc, argv);
 7     MainWindow w;
 8     w.show();
 9 
10     return a.exec();
11 }

     

posted @ 2018-04-07 17:15  喵小喵~  阅读(222)  评论(0)  编辑  收藏  举报