如此美妙的修正
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iridiumR
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6acdb21e2d
7 changed files with 439 additions and 0 deletions
26
SoftwareDesign/Code/2-2-5_enhanced/2-2-5_enhanced.pro
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26
SoftwareDesign/Code/2-2-5_enhanced/2-2-5_enhanced.pro
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QT += core gui
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
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CONFIG += c++17
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# You can make your code fail to compile if it uses deprecated APIs.
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# In order to do so, uncomment the following line.
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#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
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SOURCES += \
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cal.cpp \
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main.cpp \
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mainwindow.cpp
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HEADERS += \
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cal.h \
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mainwindow.h
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FORMS += \
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mainwindow.ui
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# Default rules for deployment.
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qnx: target.path = /tmp/$${TARGET}/bin
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else: unix:!android: target.path = /opt/$${TARGET}/bin
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!isEmpty(target.path): INSTALLS += target
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75
SoftwareDesign/Code/2-2-5_enhanced/cal.cpp
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75
SoftwareDesign/Code/2-2-5_enhanced/cal.cpp
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#include <algorithm> // remove()
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#include <cmath> // pow()
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#include <iostream>
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#include <stack> // stack<T>
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#include <stdexcept> // runtime_error
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#include <string> // string
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using std::string;
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// 返回运算符的优先级，值越大，优先级越高
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inline size_t precedence(const char op) {
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if (op == '+' || op == '-')
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return 1;
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if (op == '*' || op == '/')
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return 2;
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if (op == '^')
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return 3;
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throw std::runtime_error{string{"表达中包含无效的运算符"} + op};
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}
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// 计算
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double execute(std::stack<char> &ops, std::stack<double> &operands) {
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double result{};
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double rhs{operands.top()}; // 得到右操作数
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operands.pop();
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double lhs{operands.top()}; // 得到做操作数
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operands.pop();
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switch (ops.top()) // 根据两个操作数之间的运算符，执行相应计算
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{
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case '+':
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result = lhs + rhs;
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break;
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case '-':
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result = lhs - rhs;
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break;
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case '*':
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result = lhs * rhs;
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break;
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case '/':
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result = lhs / rhs;
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break;
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case '^':
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result = std::pow(lhs, rhs);
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break;
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default:
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throw std::runtime_error{string{"invalid operator: "} + ops.top()};
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}
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ops.pop(); //计算完成后，该运算符要弹栈
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operands.push(result); //将新计算出来的结果入栈
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return result;
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}
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double cal(string exp) {
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static std::stack<double> operands; //存储表达式中的运算符
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static std::stack<char> operators; //存储表达式中的数值
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//移除用户输入表达式中包含的无用的空格
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size_t index{};
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//每个表达式必须以数字开头,index表示该数字的位数
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operands.push(std::stod(exp, &index)); // 将表达式中第一个数字进栈
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while (true) {
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operators.push(exp[index++]); // 将运算符进栈
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size_t i{};
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operands.push(
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std::stod(exp.substr(index),
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&i)); //将运算符后的数字也进栈,并将数字的位数赋值给 i。
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index += i; //更新 index
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if (index == exp.length()) {
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while (!operators.empty()) //如果 operators不为空，表示还没有计算完
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execute(operators, operands);
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break;
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}
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//如果表达式还未遍历完，但子表达式中的运算符优先级比其后面的运算符优先级大，就先计算当前的子表达式的值
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while (!operators.empty() &&
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precedence(exp[index]) <= precedence(operators.top()))
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execute(operators, operands);
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}
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return operands.top();
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}
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5
SoftwareDesign/Code/2-2-5_enhanced/cal.h
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SoftwareDesign/Code/2-2-5_enhanced/cal.h
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#ifndef CAL_H
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#define CAL_H
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#include <iostream>
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double cal(std::string exp);
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#endif // CAL_H
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11
SoftwareDesign/Code/2-2-5_enhanced/main.cpp
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SoftwareDesign/Code/2-2-5_enhanced/main.cpp
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#include "mainwindow.h"
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#include <QApplication>
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int main(int argc, char *argv[])
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{
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QApplication a(argc, argv);
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MainWindow w;
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w.show();
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return a.exec();
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}
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94
SoftwareDesign/Code/2-2-5_enhanced/mainwindow.cpp
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SoftwareDesign/Code/2-2-5_enhanced/mainwindow.cpp
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#include "mainwindow.h"
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#include "cal.h"
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#include "ui_mainwindow.h"
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#include <QMessageBox>
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static QString displayText;
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent), ui(new Ui::MainWindow) {
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ui->setupUi(this);
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ui->lineEdit->setText("0");
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result = 0.0;
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waitForOperand = true;
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connectSlots();
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}
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MainWindow::~MainWindow() { delete ui; }
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//错误处理
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void MainWindow::abortOperation() {
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result = 0.0;
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pendingOperator.clear();
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ui->lineEdit->setText("0");
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waitForOperand = true;
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QMessageBox::warning(this, "运算错误", "除数不能为零");
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}
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//数字被点击
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void MainWindow::digitClicked() {
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QPushButton *digitBtn = static_cast<QPushButton *>(sender());
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// if(ui->lineEdit->text() == "0" && value == "0")
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// return;
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if (!isFinished) {
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displayText.append(digitBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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void MainWindow::on_clearBtn_clicked() {
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//将当前显示的数归零
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displayText.chop(1);
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ui->lineEdit->setText(displayText);
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isFinished = false;
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}
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void MainWindow::on_clearAllBtn_clicked() {
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//将当前显示的数据归零，并将之前保存的数据运算清除
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displayText.clear();
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ui->lineEdit->setText(displayText);
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isFinished = false;
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result = 0.0;
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}
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void MainWindow::on_equalBtn_clicked() {
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result = cal(displayText.toStdString());
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isFinished = 1;
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ui->lineEdit->setText(QString::number(result));
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}
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//运算符
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void MainWindow::operatorClicked() {
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QPushButton *clickedBtn = qobject_cast<QPushButton *>(sender());
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if (!isFinished) {
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displayText.append(clickedBtn->text());
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ui->lineEdit->setText(displayText);
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} else {
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return;
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}
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}
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//槽链接
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void MainWindow::connectSlots() {
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QPushButton *digitBtns[10] = {ui->digitBtn0, ui->digitBtn1, ui->digitBtn2,
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ui->digitBtn3, ui->digitBtn4, ui->digitBtn5,
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ui->digitBtn6, ui->digitBtn7, ui->digitBtn8,
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ui->digitBtn9};
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for (auto btn : digitBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::digitClicked);
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QPushButton *operatorBtns[6] = {ui->addBtn, ui->subtractionBtn,
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ui->mulBtn, ui->divisionBtn,
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ui->squareBtn, ui->pointBtn};
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for (auto btn : operatorBtns)
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connect(btn, &QPushButton::clicked, this, &MainWindow::operatorClicked);
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}
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//没用的函数，让它能编译成功
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void MainWindow::on_squareBtn_clicked() {}
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void MainWindow::on_pointBtn_clicked() {}
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void MainWindow::on_signBtn_clicked() {}
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51
SoftwareDesign/Code/2-2-5_enhanced/mainwindow.h
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SoftwareDesign/Code/2-2-5_enhanced/mainwindow.h
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#ifndef MAINWINDOW_H
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#define MAINWINDOW_H
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#include <QMainWindow>
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QT_BEGIN_NAMESPACE
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namespace Ui { class MainWindow; }
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QT_END_NAMESPACE
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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MainWindow(QWidget *parent = nullptr);
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~MainWindow();
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private:
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Ui::MainWindow *ui;
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//终止运算，清除数据，报错
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void abortOperation();
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//连接信号和槽
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void connectSlots();
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//储存运算符
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QString pendingOperator;
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//储存运算结果
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double result;
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//标记是否等待一个操作数
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bool waitForOperand;
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bool isFinished;
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private slots:
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void on_clearBtn_clicked();
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void on_clearAllBtn_clicked();
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void on_equalBtn_clicked();
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void digitClicked();
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void on_signBtn_clicked();
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void operatorClicked();
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void on_pointBtn_clicked();
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void on_squareBtn_clicked();
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};
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#endif // MAINWINDOW_H
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177
SoftwareDesign/Code/2-2-5_enhanced/mainwindow.ui
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177
SoftwareDesign/Code/2-2-5_enhanced/mainwindow.ui
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<?xml version="1.0" encoding="UTF-8"?>
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<ui version="4.0">
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<class>MainWindow</class>
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<widget class="QMainWindow" name="MainWindow">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>405</width>
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<height>320</height>
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</rect>
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</property>
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<property name="windowTitle">
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<string>Calculator_v2_4490</string>
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</property>
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<widget class="QWidget" name="centralwidget">
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<layout class="QGridLayout" name="gridLayout">
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<item row="3" column="1">
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<widget class="QPushButton" name="digitBtn5">
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<property name="text">
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<string>5</string>
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</property>
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</widget>
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</item>
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<item row="5" column="3">
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<widget class="QPushButton" name="divisionBtn">
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<property name="text">
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<string>/</string>
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</property>
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</widget>
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</item>
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<item row="2" column="2">
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<widget class="QPushButton" name="digitBtn3">
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<property name="text">
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<string>3</string>
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</property>
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</widget>
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</item>
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<item row="3" column="0">
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<widget class="QPushButton" name="digitBtn4">
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<property name="text">
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<string>4</string>
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</property>
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</widget>
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</item>
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<item row="4" column="3">
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<widget class="QPushButton" name="mulBtn">
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<property name="text">
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<string>*</string>
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</property>
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</widget>
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</item>
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<item row="2" column="1">
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<widget class="QPushButton" name="digitBtn2">
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<property name="text">
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<string>2</string>
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</property>
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</widget>
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</item>
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<item row="1" column="0">
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<widget class="QPushButton" name="clearBtn">
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<property name="text">
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<string>Clear</string>
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</property>
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</widget>
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</item>
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<item row="1" column="1">
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<widget class="QPushButton" name="clearAllBtn">
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<property name="text">
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<string>ClearAll</string>
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</property>
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</widget>
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</item>
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<item row="5" column="0">
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<widget class="QPushButton" name="pointBtn">
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<property name="text">
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<string>.</string>
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</property>
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</widget>
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</item>
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<item row="5" column="1">
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<widget class="QPushButton" name="digitBtn0">
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<property name="text">
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<string>0</string>
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</property>
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</widget>
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</item>
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<item row="1" column="2" colspan="2">
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<widget class="QPushButton" name="equalBtn">
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<property name="text">
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<string>=</string>
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</property>
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</widget>
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</item>
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<item row="2" column="0">
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<widget class="QPushButton" name="digitBtn1">
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<property name="text">
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<string>1</string>
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</property>
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</widget>
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</item>
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<item row="3" column="2">
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<widget class="QPushButton" name="digitBtn6">
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<property name="text">
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<string>6</string>
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</property>
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</widget>
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</item>
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<item row="3" column="3">
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<widget class="QPushButton" name="subtractionBtn">
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<property name="text">
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<string>-</string>
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</property>
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</widget>
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</item>
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<item row="4" column="0">
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<widget class="QPushButton" name="digitBtn7">
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<property name="text">
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<string>7</string>
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</property>
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</widget>
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</item>
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<item row="0" column="0" colspan="4">
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<widget class="QLineEdit" name="lineEdit">
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<property name="alignment">
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<set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
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</property>
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<property name="readOnly">
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<bool>true</bool>
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</property>
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</widget>
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</item>
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<item row="4" column="1">
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<widget class="QPushButton" name="digitBtn8">
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<property name="text">
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<string>8</string>
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</property>
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</widget>
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</item>
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<item row="4" column="2">
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<widget class="QPushButton" name="digitBtn9">
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<property name="text">
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<string>9</string>
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</property>
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</widget>
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</item>
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<item row="2" column="3">
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<widget class="QPushButton" name="addBtn">
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<property name="text">
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<string>+</string>
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</property>
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</widget>
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</item>
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<item row="5" column="2">
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<widget class="QPushButton" name="squareBtn">
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<property name="text">
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<string>^</string>
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</property>
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</widget>
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</item>
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</layout>
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</widget>
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<widget class="QMenuBar" name="menubar">
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<property name="geometry">
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<rect>
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<x>0</x>
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<y>0</y>
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<width>405</width>
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<height>30</height>
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</rect>
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</property>
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</widget>
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<widget class="QStatusBar" name="statusbar"/>
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</widget>
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<resources/>
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<connections/>
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</ui>
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