带界面简单计算器程序Qt源代码

#include "mainwindow.h" #include "ui_mainwindow.h" #include <QDebug> #include <QMessageBox> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); after=""; before="0"; showstr=""; op=""; } MainWindow::~MainWindow() { delete ui; } //按键1 void MainWindow::on_pushButton_clicked() { after+="1"; showstr+="1"; print(); } void MainWindow::on_pushButton_2_clicked() { after+="2"; showstr+="2"; print(); } void MainWindow::on_pushButton_3_clicked() { after+="3"; showstr+="3"; print(); } void MainWindow::on_pushButton_5_clicked() { after+="4"; showstr+="4"; print(); } void MainWindow::on_pushButton_6_clicked() { after+="5"; showstr+="5"; print(); } void MainWindow::on_pushButton_7_clicked() { after+="6"; showstr+="6"; print(); } void MainWindow::on_pushButton_9_clicked() { after+="7"; showstr+="7"; print(); } void MainWindow::on_pushButton_10_clicked() { after+="8"; showstr+="8"; print(); } void MainWindow::on_pushButton_11_clicked() { after+="9"; showstr+="9"; print(); } void MainWindow::on_pushButton_14_clicked() { after+="0"; showstr+="0"; print(); } //计算过程 void MainWindow::process() { if(op=="") { before=after; } else if (op=="+") { int temp=after.toInt()+before.toInt(); qDebug()<<before.toInt()<<after.toInt(); before=QString::number(temp); qDebug()<<before.toInt(); } else if (op=="-") { int temp=before.toInt()-after.toInt(); qDebug()<<before.toInt()<<after.toInt(); before=QString::number(temp); qDebug()<<before.toInt(); } else if (op=="*") { int temp=after.toInt()*before.toInt(); qDebug()<<before.toInt()<<after.toInt(); before=QString::number(temp); qDebug()<<before.toInt(); } else if (op=="/") { if(after.toInt()==0) { QMessageBox::about(this,"error","can not / 0!"); return ; } int temp=before.toInt()/after.toInt(); qDebug()<<before.toInt()<<after.toInt(); before=QString::number(temp); qDebug()<<before.toInt(); } after=""; } //print void MainWindow::print() { ui->lineEdit->setText(showstr); } //+ void MainWindow::on_pushButton_4_clicked() { showstr+="+"; print(); qDebug()<<"+"; process(); op="+"; } //- void MainWindow::on_pushButton_8_clicked() { showstr+="-"; print(); qDebug()<<"-"; process(); op="-"; } //* void MainWindow::on_pushButton_12_clicked() { showstr+="*"; print(); qDebug()<<"*"; process(); op="*"; } //\/ void MainWindow::on_pushButton_16_clicked() { showstr+="/"; print(); qDebug()<<"/"; process(); op="/"; } //= void MainWindow::on_pushButton_15_clicked() { showstr+="="; process(); showstr+=before; print(); showstr=after=before=op=""; } //C void MainWindow::on_pushButton_13_clicked() { ui->lineEdit->setText(""); }