\u4e8c\u3001\u6838\u5fc3\u5f00\u53d1\u6b65\u9aa4<\/h3>\n\u6b65\u9aa4 1：\u5934\u6587\u4ef6\u8bbe\u8ba1（calculator.h）<\/h4>\n
\u9996\u5148\u5b9a\u4e49Calculator\u7c7b，\u7ee7\u627f\u81eaQWidget（Qt \u57fa\u7840\u7a97\u53e3\u7c7b），\u6838\u5fc3\u5305\u542b：<\/p>\n
- \n
- \u6210\u5458\u53d8\u91cf：\u663e\u793a\u6846（QLineEdit）\u3001\u8fd0\u7b97\u8868\u8fbe\u5f0f（QString）<\/li>\n
- \u69fd\u51fd\u6570：\u5904\u7406\u6309\u94ae\u70b9\u51fb\u3001\u6e05\u7a7a\u3001\u9000\u683c\u3001\u8ba1\u7b97\u903b\u8f91<\/li>\n
- \u79c1\u6709\u65b9\u6cd5：\u521d\u59cb\u5316\u754c\u9762\u3001\u521d\u59cb\u5316\u6837\u5f0f\u8868<\/li>\n<\/ul>\n
#ifndef CALCULATOR_H
\n#define CALCULATOR_H<\/p>\n#include <QWidget>
\n#include <QLineEdit>
\n#include <QPushButton>
\n#include <QGridLayout>
\n#include <QString><\/p>\nclass Calculator : public QWidget
\n{
\n Q_OBJECT \/\/ \u5fc5\u987b\u6dfb\u52a0，\u542f\u7528Qt\u4fe1\u53f7\u69fd\u673a\u5236<\/p>\npublic:
\n Calculator(QWidget *parent = nullptr);
\n ~Calculator() = default;<\/p>\nprivate slots:
\n \/\/ \u6570\u5b57\/\u8fd0\u7b97\u7b26\u6309\u94ae\u70b9\u51fb\u69fd\u51fd\u6570
\n void onButtonClicked();
\n \/\/ \u6e05\u7a7a\u663e\u793a\u6846
\n void onClearClicked();
\n \/\/ \u9000\u683c（\u5220\u9664\u6700\u540e\u4e00\u4e2a\u5b57\u7b26）
\n void onBackspaceClicked();
\n \/\/ \u8ba1\u7b97\u7ed3\u679c
\n void onCalculateClicked();<\/p>\nprivate:
\n QLineEdit *m_display; \/\/ \u663e\u793a\u8f93\u5165\/\u7ed3\u679c\u7684\u6587\u672c\u6846
\n QString m_expression; \/\/ \u5b58\u50a8\u7528\u6237\u8f93\u5165\u7684\u8fd0\u7b97\u8868\u8fbe\u5f0f
\n \/\/ \u521d\u59cb\u5316\u754c\u9762\u5e03\u5c40\u548c\u63a7\u4ef6
\n void initUI();
\n \/\/ \u521d\u59cb\u5316\u63a7\u4ef6\u6837\u5f0f\u8868
\n void initStyle();
\n};<\/p>\n#endif \/\/ CALCULATOR_H<\/p>\n
\u6b65\u9aa4 2：\u754c\u9762\u521d\u59cb\u5316（calculator.cpp – initUI \u65b9\u6cd5）<\/h4>\n
\u8ba1\u7b97\u5668\u754c\u9762\u91c7\u7528QGridLayout（\u7f51\u683c\u5e03\u5c40）\u5b9e\u73b0，\u4f18\u52bf\u662f\u80fd\u7cbe\u51c6\u63a7\u5236\u63a7\u4ef6\u7684\u884c\u5217\u4f4d\u7f6e，\u8d34\u5408\u8ba1\u7b97\u5668\u7684\u5e03\u5c40\u7279\u70b9\u3002<\/p>\n
\u6838\u5fc3\u903b\u8f91：<\/h5>\n
- \n
- \u663e\u793a\u6846\u914d\u7f6e：\u8bbe\u7f6e\u53f3\u5bf9\u9f50\u3001\u53ea\u8bfb\u3001\u653e\u5927\u5b57\u4f53，\u7981\u6b62\u624b\u52a8\u8f93\u5165（\u4ec5\u901a\u8fc7\u6309\u94ae\u89e6\u53d1）；<\/li>\n
- \u6309\u94ae\u521b\u5efa：\u6309\u8ba1\u7b97\u5668\u5e03\u5c40\u521b\u5efa\u6570\u5b57\u3001\u8fd0\u7b97\u7b26\u3001\u529f\u80fd\u6309\u94ae；<\/li>\n
- \u7f51\u683c\u5e03\u5c40：\u5c06\u663e\u793a\u6846\u3001\u6309\u94ae\u6dfb\u52a0\u5230\u7f51\u683c，\u8bbe\u7f6e\u95f4\u8ddd\u548c\u5185\u8fb9\u8ddd；<\/li>\n
- \u4fe1\u53f7\u69fd\u7ed1\u5b9a：\u6570\u5b57 \/ \u8fd0\u7b97\u7b26\u6309\u94ae\u7ed1\u5b9a\u901a\u7528\u69fd\u51fd\u6570，\u529f\u80fd\u6309\u94ae\u7ed1\u5b9a\u4e13\u5c5e\u69fd\u51fd\u6570\u3002<\/li>\n<\/ul>\n
#include "calculator.h"
\n#include <QDebug>
\n#include <QRegExp>
\n#include <cmath><\/p>\nCalculator::Calculator(QWidget *parent)
\n : QWidget(parent),
\n m_display(new QLineEdit(this)),
\n m_expression("")
\n{
\n initUI(); \/\/ \u521d\u59cb\u5316\u754c\u9762\u5e03\u5c40
\n initStyle(); \/\/ \u521d\u59cb\u5316\u6837\u5f0f\u8868
\n}<\/p>\n\/\/ \u521d\u59cb\u5316\u754c\u9762：\u5e03\u5c40+\u63a7\u4ef6\u521b\u5efa+\u4fe1\u53f7\u69fd\u7ed1\u5b9a
\nvoid Calculator::initUI()
\n{
\n \/\/ 1. \u663e\u793a\u6846\u5c5e\u6027\u914d\u7f6e
\n m_display->setAlignment(Qt::AlignRight); \/\/ \u53f3\u5bf9\u9f50
\n m_display->setReadOnly(true); \/\/ \u53ea\u8bfb，\u7981\u6b62\u624b\u52a8\u8f93\u5165
\n m_display->setFont(QFont("\u5fae\u8f6f\u96c5\u9ed1", 18)); \/\/ \u5b57\u4f53\u653e\u5927
\n m_display->setMinimumHeight(60); \/\/ \u8bbe\u7f6e\u6700\u5c0f\u9ad8\u5ea6<\/p>\n\/\/ 2. \u521b\u5efa\u6240\u6709\u6309\u94ae
\n QPushButton *btnAC = new QPushButton("AC", this);
\n QPushButton *btnBack = new QPushButton("\u2190", this);
\n QPushButton *btnDiv = new QPushButton("\u00f7", this);
\n QPushButton *btnMul = new QPushButton("\u00d7", this);
\n QPushButton *btn7 = new QPushButton("7", this);
\n QPushButton *btn8 = new QPushButton("8", this);
\n QPushButton *btn9 = new QPushButton("9", this);
\n QPushButton *btnSub = new QPushButton("-", this);
\n QPushButton *btn4 = new QPushButton("4", this);
\n QPushButton *btn5 = new QPushButton("5", this);
\n QPushButton *btn6 = new QPushButton("6", this);
\n QPushButton *btnAdd = new QPushButton("+", this);
\n QPushButton *btn1 = new QPushButton("1", this);
\n QPushButton *btn2 = new QPushButton("2", this);
\n QPushButton *btn3 = new QPushButton("3", this);
\n QPushButton *btnEqual = new QPushButton("=", this);
\n QPushButton *btn0 = new QPushButton("0", this);
\n QPushButton *btnDot = new QPushButton(".", this);<\/p>\n\/\/ 3. \u7f51\u683c\u5e03\u5c40\u914d\u7f6e
\n QGridLayout *mainLayout = new QGridLayout(this);
\n mainLayout->setSpacing(8); \/\/ \u63a7\u4ef6\u95f4\u8ddd
\n mainLayout->setContentsMargins(15, 15, 15, 15); \/\/ \u5e03\u5c40\u5185\u8fb9\u8ddd<\/p>\n\/\/ 4. \u6dfb\u52a0\u63a7\u4ef6\u5230\u7f51\u683c（\u884c\u3001\u5217\u3001\u5360\u7528\u884c\u3001\u5360\u7528\u5217）
\n mainLayout->addWidget(m_display, 0, 0, 1, 4); \/\/ \u663e\u793a\u6846\u8de84\u5217
\n mainLayout->addWidget(btnAC, 1, 0);
\n mainLayout->addWidget(btnBack, 1, 1);
\n mainLayout->addWidget(btnDiv, 1, 2);
\n mainLayout->addWidget(btnMul, 1, 3);
\n mainLayout->addWidget(btn7, 2, 0);
\n mainLayout->addWidget(btn8, 2, 1);
\n mainLayout->addWidget(btn9, 2, 2);
\n mainLayout->addWidget(btnSub, 2, 3);
\n mainLayout->addWidget(btn4, 3, 0);
\n mainLayout->addWidget(btn5, 3, 1);
\n mainLayout->addWidget(btn6, 3, 2);
\n mainLayout->addWidget(btnAdd, 3, 3);
\n mainLayout->addWidget(btn1, 4, 0);
\n mainLayout->addWidget(btn2, 4, 1);
\n mainLayout->addWidget(btn3, 4, 2);
\n mainLayout->addWidget(btnEqual, 4, 3, 2, 1); \/\/ \u7b49\u53f7\u8de82\u884c
\n mainLayout->addWidget(btn0, 5, 0, 1, 2); \/\/ 0\u8de82\u5217
\n mainLayout->addWidget(btnDot, 5, 2);<\/p>\n\/\/ 5. \u4fe1\u53f7\u69fd\u7ed1\u5b9a
\n \/\/ \u6570\u5b57\/\u8fd0\u7b97\u7b26\u6309\u94ae\u7ed1\u5b9a\u901a\u7528\u69fd\u51fd\u6570
\n QList<QPushButton*> btnList = {btn0,btn1,btn2,btn3,btn4,btn5,btn6,btn7,btn8,btn9,
\n btnAdd,btnSub,btnMul,btnDiv,btnDot};
\n for (QPushButton *btn : btnList) {
\n connect(btn, &QPushButton::clicked, this, &Calculator::onButtonClicked);
\n }
\n \/\/ \u529f\u80fd\u6309\u94ae\u7ed1\u5b9a\u4e13\u5c5e\u69fd\u51fd\u6570
\n connect(btnAC, &QPushButton::clicked, this, &Calculator::onClearClicked);
\n connect(btnBack, &QPushButton::clicked, this, &Calculator::onBackspaceClicked);
\n connect(btnEqual, &QPushButton::clicked, this, &Calculator::onCalculateClicked);<\/p>\n\/\/ \u8bbe\u7f6e\u7a97\u53e3\u56fa\u5b9a\u5927\u5c0f
\n this->setFixedSize(300, 400);
\n this->setWindowTitle("Qt\u8ba1\u7b97\u5668");
\n}<\/p>\n\u6b65\u9aa4 3：\u6837\u5f0f\u7f8e\u5316（calculator.cpp – initStyle \u65b9\u6cd5）<\/h4>\n
\u901a\u8fc7 Qt \u6837\u5f0f\u8868（QSS）\u7f8e\u5316\u63a7\u4ef6，\u5b9e\u73b0\u5706\u89d2\u3001hover \/ \u6309\u4e0b\u72b6\u6001\u3001\u529f\u80fd\u6309\u94ae\u5dee\u5f02\u5316\u914d\u8272，\u63d0\u5347\u754c\u9762\u8d28\u611f\u3002<\/p>\n
\/\/ \u521d\u59cb\u5316\u6837\u5f0f\u8868：\u7f8e\u5316\u663e\u793a\u6846\u3001\u6309\u94ae
\nvoid Calculator::initStyle()
\n{
\n \/\/ \u663e\u793a\u6846\u6837\u5f0f：\u5706\u89d2\u3001\u8fb9\u6846\u3001\u80cc\u666f\u8272
\n m_display->setStyleSheet(R"(
\n QLineEdit {
\n background-color: #f8f9fa;
\n border: 2px solid #ced4da;
\n border-radius: 8px;
\n padding-right: 10px;
\n color: #212529;
\n }
\n )");<\/p>\n\/\/ \u5168\u5c40\u6309\u94ae\u6837\u5f0f + \u5dee\u5f02\u5316\u914d\u8272
\n this->setStyleSheet(R"(
\n QPushButton {
\n font: bold 16px "\u5fae\u8f6f\u96c5\u9ed1";
\n background-color: #e9ecef;
\n border: none;
\n border-radius: 8px;
\n color: #212529;
\n min-height: 40px;
\n }
\n QPushButton:hover { \/* \u9f20\u6807\u60ac\u505c *\/
\n background-color: #dee2e6;
\n }
\n QPushButton:pressed { \/* \u6309\u94ae\u6309\u4e0b *\/
\n background-color: #adb5bd;
\n }
\n \/* \u8fd0\u7b97\u7b26\u6309\u94ae：\u9ec4\u8272\u7cfb *\/
\n QPushButton[text="+"], QPushButton[text="-"],
\n QPushButton[text="\u00d7"], QPushButton[text="\u00f7"] {
\n background-color: #ffc107;
\n color: white;
\n }
\n QPushButton[text="+"]:hover, QPushButton[text="-"]:hover,
\n QPushButton[text="\u00d7"]:hover, QPushButton[text="\u00f7"]:hover {
\n background-color: #ffca2c;
\n }
\n \/* \u7b49\u53f7\u6309\u94ae：\u7eff\u8272\u7cfb *\/
\n QPushButton[text="="] {
\n background-color: #28a745;
\n color: white;
\n }
\n QPushButton[text="="]:hover {
\n background-color: #20c997;
\n }
\n \/* \u529f\u80fd\u6309\u94ae：\u7ea2\u8272\u7cfb *\/
\n QPushButton[text="AC"], QPushButton[text="\u2190"] {
\n background-color: #dc3545;
\n color: white;
\n }
\n QPushButton[text="AC"]:hover, QPushButton[text="\u2190"]:hover {
\n background-color: #e55353;
\n }
\n )");
\n}<\/p>\n\u6b65\u9aa4 4：\u4e1a\u52a1\u903b\u8f91\u5b9e\u73b0（calculator.cpp）<\/h4>\n
4.1 \u6570\u5b57 \/ \u8fd0\u7b97\u7b26\u8f93\u5165（onButtonClicked）<\/h5>\n
\u83b7\u53d6\u70b9\u51fb\u6309\u94ae\u7684\u6587\u672c，\u62fc\u63a5\u6210\u8fd0\u7b97\u8868\u8fbe\u5f0f\u5e76\u663e\u793a\u5728\u8f93\u5165\u6846\u4e2d\u3002<\/p>\n
\/\/ \u6570\u5b57\/\u8fd0\u7b97\u7b26\u6309\u94ae\u70b9\u51fb：\u62fc\u63a5\u8868\u8fbe\u5f0f\u5e76\u663e\u793a
\nvoid Calculator::onButtonClicked()
\n{
\n QPushButton *btn = qobject_cast<QPushButton*>(sender()); \/\/ \u83b7\u53d6\u70b9\u51fb\u7684\u6309\u94ae
\n if (!btn) return;
\n QString text = btn->text();
\n m_expression += text; \/\/ \u62fc\u63a5\u8868\u8fbe\u5f0f
\n m_display->setText(m_expression); \/\/ \u663e\u793a\u5230\u8f93\u5165\u6846
\n qDebug() << "\u5f53\u524d\u8868\u8fbe\u5f0f：" << m_expression; \/\/ \u8c03\u8bd5\u8f93\u51fa
\n}<\/p>\n4.2 \u6e05\u7a7a\u4e0e\u9000\u683c（onClearClicked\/onBackspaceClicked）<\/h5>\n
- \n
- \u6e05\u7a7a：\u91cd\u7f6e\u8868\u8fbe\u5f0f\u548c\u663e\u793a\u6846；<\/li>\n
- \u9000\u683c：\u5220\u9664\u8868\u8fbe\u5f0f\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n
\/\/ \u6e05\u7a7a：\u91cd\u7f6e\u8868\u8fbe\u5f0f\u548c\u663e\u793a\u6846
\nvoid Calculator::onClearClicked()
\n{
\n m_expression.clear();
\n m_display->clear();
\n qDebug() << "\u5df2\u6e05\u7a7a\u8868\u8fbe\u5f0f";
\n}<\/p>\n\/\/ \u9000\u683c：\u5220\u9664\u6700\u540e\u4e00\u4e2a\u5b57\u7b26
\nvoid Calculator::onBackspaceClicked()
\n{
\n if (!m_expression.isEmpty()) {
\n m_expression.chop(1); \/\/ \u79fb\u9664\u6700\u540e\u4e00\u4e2a\u5b57\u7b26
\n m_display->setText(m_expression);
\n qDebug() << "\u9000\u683c\u540e\u8868\u8fbe\u5f0f：" << m_expression;
\n }
\n}<\/p>\n4.3 \u8fd0\u7b97\u903b\u8f91（onCalculateClicked）<\/h5>\n
\u6838\u5fc3\u903b\u8f91：\u89e3\u6790\u8868\u8fbe\u5f0f，\u66ff\u6362 Qt \u663e\u793a\u7684\u00d7\/\u00f7\u4e3a C++ \u8bc6\u522b\u7684*\/，\u901a\u8fc7\u6b63\u5219\u5339\u914d\u63d0\u53d6\u6570\u5b57\u548c\u8fd0\u7b97\u7b26，\u6267\u884c\u56db\u5219\u8fd0\u7b97，\u5e76\u5904\u7406\u9664\u96f6\u9519\u8bef\u3001\u8868\u8fbe\u5f0f\u9519\u8bef\u7b49\u5f02\u5e38\u3002<\/p>\n
\/\/ \u8ba1\u7b97\u7ed3\u679c：\u89e3\u6790\u8868\u8fbe\u5f0f，\u5b8c\u6210\u52a0\u51cf\u4e58\u9664\u8fd0\u7b97
\nvoid Calculator::onCalculateClicked()
\n{
\n if (m_expression.isEmpty()) return;
\n \/\/ \u66ff\u6362\u00d7\u4e3a*\u3001\u00f7\u4e3a\/，\u9002\u914dC++\u8fd0\u7b97\u89c4\u5219
\n QString expr = m_expression;
\n expr.replace("\u00d7", "*").replace("\u00f7", "\/");
\n qDebug() << "\u89e3\u6790\u540e\u7684\u8fd0\u7b97\u8868\u8fbe\u5f0f：" << expr;<\/p>\n\/\/ \u6b63\u5219\u5339\u914d：\u6570\u5b57+\u8fd0\u7b97\u7b26+\u6570\u5b57 \u683c\u5f0f（\u652f\u6301\u5c0f\u6570）
\n QRegExp regExp("(\\\\\\\\d+\\\\\\\\.?\\\\\\\\d*)\\\\\\\\s*([+\\\\\\\\-*\/])\\\\\\\\s*(\\\\\\\\d+\\\\\\\\.?\\\\\\\\d*)");
\n if (regExp.indexIn(expr) != -1) {
\n double num1 = regExp.cap(1).toDouble(); \/\/ \u7b2c\u4e00\u4e2a\u6570\u5b57
\n QString op = regExp.cap(2); \/\/ \u8fd0\u7b97\u7b26
\n double num2 = regExp.cap(3).toDouble(); \/\/ \u7b2c\u4e8c\u4e2a\u6570\u5b57
\n double result = 0.0;<\/p>\n\/\/ \u6267\u884c\u8fd0\u7b97
\n if (op == "+") result = num1 + num2;
\n else if (op == "-") result = num1 – num2;
\n else if (op == "*") result = num1 * num2;
\n else if (op == "\/") {
\n if (qFuzzyCompare(num2, 0.0)) { \/\/ \u9632\u6b62\u9664\u96f6（\u6d6e\u70b9\u7cbe\u5ea6\u5904\u7406）
\n m_display->setText("\u9519\u8bef：\u9664\u96f6");
\n m_expression.clear();
\n return;
\n }
\n result = num1 \/ num2;
\n }<\/p>\n\/\/ \u663e\u793a\u7ed3\u679c：\u79fb\u9664\u672b\u5c3e\u591a\u4f59\u76840\u548c\u5c0f\u6570\u70b9
\n QString resText = QString::number(result, 'f', 6).remove(QRegExp("\\\\\\\\.?0+$"));
\n m_display->setText(resText);
\n \/\/ \u7ed3\u679c\u4f5c\u4e3a\u4e0b\u4e00\u6b21\u8fd0\u7b97\u7684\u521d\u59cb\u503c
\n m_expression = resText;
\n qDebug() << "\u8fd0\u7b97\u7ed3\u679c：" << num1 << op << num2 << "=" << result;
\n } else {
\n m_display->setText("\u8868\u8fbe\u5f0f\u9519\u8bef");
\n m_expression.clear();
\n qDebug() << "\u8868\u8fbe\u5f0f\u683c\u5f0f\u9519\u8bef：" << expr;
\n }
\n}<\/p>\n\u6b65\u9aa4 5：\u7a0b\u5e8f\u5165\u53e3（main.cpp）<\/h4>\n
\u521b\u5efa Qt \u5e94\u7528\u7a0b\u5e8f\u5bf9\u8c61，\u5b9e\u4f8b\u5316\u8ba1\u7b97\u5668\u7a97\u53e3\u5e76\u663e\u793a，\u542f\u52a8\u4e8b\u4ef6\u5faa\u73af\u3002<\/p>\n
#include "calculator.h"
\n#include <QApplication>
\n#include<mainwindow.h><\/p>\nint main(int argc, char *argv[])
\n{
\n QApplication a(argc, argv);
\n Calculator w; \/\/ \u8ba1\u7b97\u5668\u7a97\u53e3
\n w.show(); \/\/ \u663e\u793a\u7a97\u53e3
\n w.setWindowTitle("chenchen");
\n MainWindow m; \/\/ \u53ef\u6839\u636e\u9700\u6c42\u5220\u9664，\u672c\u6587\u6838\u5fc3\u4e3aCalculator
\n m.show();
\n return a.exec(); \/\/ \u8fd0\u884cQt\u4e8b\u4ef6\u5faa\u73af
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