qt 计算器

vv计算器1.00

头文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include
#include 

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
public slots:
  //  void hello(int b);
signals:// zi ding yi xin hao
    //void asignal(int a);

private slots:
    void on_actionAa2_triggered();

    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_pushButton_3_clicked();

    void on_pushButton_4_clicked();

    void on_pushButton_5_clicked();

    void on_pushButton_6_clicked();

    void on_pushButton_9_clicked();

    void on_pushButton_7_clicked();

    void on_pushButton_8_clicked();

    void on_pushButton_12_clicked();

    void on_pushButton_11_clicked();

    void on_pushButton_10_clicked();

    void on_pushButton_14_clicked();

    void on_pushButton_15_clicked();

    void on_pushButton_13_clicked();

    void on_pushButton_16_clicked();

    void on_pushButton_17_clicked();
private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

主函数

#include "mainwindow.h"
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

int step=1;//判断是第几个数
int num1=0;
int num2=0;
int sig=0;//1+2-3*4/加减乘除判断变量
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //connect(this,SIGNAL(asignal(int)),this,SLOT(hello(int)));//这是另一个题的东西，自定义信号和传参信号

}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_actionAa2_triggered()
{
    close();
}

void MainWindow::on_pushButton_clicked()//点击1时下面雷同
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="1";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+1;
    else
        num2=num2*10+1;
}

void MainWindow::on_pushButton_2_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="2";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+2;
    else
        num2=num2*10+2;
}

void MainWindow::on_pushButton_3_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="3";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+3;
    else
        num2=num2*10+3;
}


void MainWindow::on_pushButton_4_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="4";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+4;
    else
        num2=num2*10+4;
}


void MainWindow::on_pushButton_5_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="5";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+5;
    else
        num2=num2*10+5;
}


void MainWindow::on_pushButton_6_clicked()
{
        QString newText;
        QString str = ui->lineEdit->text();
        newText="6";
        str = str+newText;
        ui->lineEdit->setText(str);
        if(step==1)
            num1=num1*10+6;
        else
            num2=num2*10+6;
}

void MainWindow::on_pushButton_9_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="7";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+7;
    else
        num2=num2*10+7;
}

void MainWindow::on_pushButton_7_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="8";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+8;
    else
        num2=num2*10+8;
}

void MainWindow::on_pushButton_8_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="9";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10+9;
    else
        num2=num2*10+9;
}

void MainWindow::on_pushButton_12_clicked()//++++++++
{
        QString newText;
        QString str = ui->lineEdit->text();
        newText="+";
        str = str+newText;
        ui->lineEdit->setText(str);
        step++;
        sig=1;
}

void MainWindow::on_pushButton_11_clicked()//======== =号
{
    if(step==2)
    {\
        if(sig==1)
            {
                num1=num1+num2;
            }
        if(sig==2)
            {
                num1=num1-num2;
            }
        if(sig==3)
            {
                num1=num1*num2;
            }
        if(sig==4)
            {
                num1=num1/num2;
            }
        QString newText;
        QString str = ui->lineEdit->text();
        newText="=";
        QString temp =QString::number(num1,10);//把数字打印到文本框
        str = str+newText+temp;
        ui->lineEdit->setText(str);
    }

}

void MainWindow::on_pushButton_10_clicked()//_______减号
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="-";
    str = str+newText;
    ui->lineEdit->setText(str);
    step++;
    sig=2;
}

void MainWindow::on_pushButton_14_clicked()//*********
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="x";
    str = str+newText;
    ui->lineEdit->setText(str);
    step++;
    sig=3;
}

void MainWindow::on_pushButton_15_clicked()
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="/";
    str = str+newText;
    ui->lineEdit->setText(str);
    step++;
    sig=4;
}

void MainWindow::on_pushButton_13_clicked()
{
    QString newT="\0";
    ui->lineEdit->setText(newT);
    step=1;
    num1=0,num2=0;
    sig=0;
}

void MainWindow::on_pushButton_16_clicked()
{
    close();
}

void MainWindow::on_pushButton_17_clicked()//0
{
    QString newText;
    QString str = ui->lineEdit->text();
    newText="0";
    str = str+newText;
    ui->lineEdit->setText(str);
    if(step==1)
        num1=num1*10;
    else
        num2=num2*10;
}