项目一：科学计算器源码

#include "mainwindow.h" #include "ui_mainwindow.h" #include "mycal.h" #include <QMessageBox> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { init(); ui->setupUi(this); // connect(ui->equal, SIGNAL(clicked()), this, SLOT(on_equal_clicked())); ui->input->setAlignment(Qt::AlignRight); //输入框右对齐 ui->formula->setAlignment(Qt::AlignRight); //表达式框右对齐 ui->histoyText->setAlignment(Qt::AlignRight); //历史记录框右对齐 ui->input->setText("0"); //输入框初始值显示0 ui->histoyText->setText("尚无历史记录"); //历史记录初始值设置 clearall = false; //清除标志 eq = false; //是否有历史记录 // connect(ui->equal, SIGNAL(clicked()), this, SLOT(on_equal_clicked())); // change = new history(); // connect(this,SIGNAL(sendStr(QString)),change,SLOT(clearall1(QString))); // connect(this,SIGNAL(sendStr1(QString)),change,SLOT(insert1(QString))); // connect(this,SIGNAL(sendStr2(QString)),change,SLOT(changeline(QString))); // connect(this->ui->equal,SIGNAL(sendStr2(QString)),change,SLOT(insert1(QString))); // emit sendStr2(ui->histoyText->toPlainText()); } MainWindow::~MainWindow() { delete ui; } void MainWindow::init(){ isFold=1; // ui->btn_fold->setStyleSheet("QPushButton {" // "background-color: white; /* 设置背景颜色 */" // "color: white; /* 设置文本颜色 */" // "border: none; /* 移除边框 */" // "border-radius: 20px; /* 设置圆角 */" // "padding: 10px 20px; /* 设置内边距 */" // "}" // "QPushButton:hover {" // "background-color: : white; /* 鼠标悬停时的背景颜色 */" // "}"); } void MainWindow::on_one_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"1"); } void MainWindow::on_two_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"2"); } void MainWindow::on_three_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"3"); } void MainWindow::on_four_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"4"); } void MainWindow::on_five_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"5"); } void MainWindow::on_six_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"6"); } void MainWindow::on_seven_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"7"); } void MainWindow::on_eight_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"8"); } void MainWindow::on_nine_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"9"); } void MainWindow::on_zero_clicked() { if(ui->input->text() == "0") { ui->input->clear(); } QString s = ui->formula->text(); int n = s.length(); if(n != 0 && s[n - 1] == ')') //数字前不能出现右括号 { QMessageBox::information(NULL, "错误","数字前不能为右括号!", QMessageBox::Yes,QMessageBox::Yes); return; } ui->input->setText(ui->input->text()+"0"); } void MainWindow::on_pushButton_3_clicked() //小数点 { QString s = ui->input->text(); //获取之前输入的数字 int n = s.length(); if(n != 0 && (s[n - 1] > '9' || s[n - 1] < '0')) //小数点前没有数字 { QMessageBox::information(NULL, "错误","小数点前应输入数字!", QMessageBox::Yes,QMessageBox::Yes); return; } else if(n == 0) //不能小数点开头 { QMessageBox::information(NULL, "错误","小数点前为空!", QMessageBox::Yes,QMessageBox::Yes); return; } for(int i = 0; i < n; ++ i) { if(s[i] == '.') //这个数字前是否还有小数点 { QMessageBox::information(NULL, "错误","只能有一个小数点!", QMessageBox::Yes,QMessageBox::Yes); return; break; } } ui->input->setText(ui->input->text()+"."); } void MainWindow::on_symbol_clicked() //正负号 { if(ui->input->text()[0