Welcome to the 【Ultimate Programmer】 WeChat public account 【Knowledge Repository】, specially customized for everyone《Qt C++ Architect》 Series–Qt Project Practical Application Issue 121:This issue will focus on a practical and challenging technical topic–【C++17 Features and Qt Framework: High-Performance Cross-Platform Programmer’s Scientific Calculator】.Whether you are a beginner who has just mastered the Qt cross-platform framework and Linux C/C++ backend server development, or a developer who wants to delve into the research of C/C++ system architecture, this technology will open a door to deep learning, enhancing your technical development and architecture design capabilities, meeting the technical requirements of enterprise-level development positions. Wishing everyone success in their studies.

【Development Environment】: Win10/11 x64, Qt version 6.5;

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1: 【Project】🚀 Running Results

1: Initialization Interface

2: Test Base Conversion

3: Complex Number Conversion Test: 4294967295

4: Left Shift 1 Bit (Decimal 25)

The remaining functions can be operated by everyone.

2: 【Project】🏗️ Project Overview and Features

A professional calculator supporting binary, octal, decimal, hexadecimal conversion and advanced bitwise operations

1: 🔢 Multi-Base Conversion

BIN (Binary) – 0b11111111
OCT (Octal) – 0377
DEC (Decimal) – 255
HEX (Hexadecimal) – 0xFF
Real-time conversion – Automatically synchronously displayed while inputting

2: ⚡ High-Performance Computation

Arithmetic Operations: + – * / %(Addition, Subtraction, Multiplication, Division, Modulus)
Bitwise Logical Operations: & | ^ ~(AND, OR, XOR, NOT)
Shift Operations: << >>(Left Shift, Right Shift)
Bit Rotation: ROL ROR(Circular Left Shift, Circular Right Shift)
Signed/Unsigned Mode Switching

3: 🎯 Real-time Bit Visualization

32-bit binary display – Each bit’s status is clearly visible
Grouped Highlighting – Grouped by 8 bits for easy reading
Interactive Bit Operations – Click to flip any bit
Color Coding – Different colors for different bit groups

4: Technical Implementation

【Architecture Design】

Single Responsibility Principle** – Each function focuses on a single task
Modular Design** – Separation of UI settings, calculation logic, and event handling
Object-Oriented** – Complete class encapsulation and interface design

【Key Technologies】

Qt Framework – Cross-platform UI and event handling
C++17 – Modern C++ features and performance optimizations
Bitwise Operations – Efficient binary operations
Event-Driven – Responsive user interaction

【Design Patterns】

Observer Pattern – UI state synchronization updates
Strategy Pattern – Different strategies for base handling
Factory Pattern – UI component creation and configuration

3: 【Project】📋 Source Code Analysis

1: main.cpp File

/*************************************************************************** * File Name: main.cpp * Program Version: V2.0 High-Performance Optimized Version * Creation Date: January 2025 * Last Modified: January 2025 * * Function Description: Entry point for the programmer's high-performance calculation tool *           * Main Functions: * 1. Initialize Qt application environment * 2. Configure dark theme interface style * 3. Create and display calculator main window * 4. Start Qt event loop *  * Performance Optimization Features: * - Streamlined program entry for quick startup * - Optimized theme configuration to reduce UI rendering overhead * - Clear code structure for easier maintenance *  * Design Philosophy: * - Single Responsibility: Only responsible for program startup and theme configuration * - Module Separation: UI logic is completely handled by the Calculator class * - High Cohesion and Low Coupling: Minimize coupling with business logic * * Author Information: Vico * Technical Support: QQ Group ***************************************************************************/#include "calculator.h"     // Header file for the main calculator class#include <QApplication>     // Qt application base class#include <QPalette>         // Qt palette class for theme configuration#include <QStyleFactory>    // Qt style factory class/** * @brief Main entry function of the program * @param argc Number of command line arguments * @param argv Command line argument array * @return Program exit code (0 indicates normal exit) *  * Function Execution Flow: * 1. Create QApplication instance, initialize Qt environment * 2. Set Fusion style for a modern appearance * 3. Configure dark theme palette to protect programmer's eyesight * 4. Create Calculator instance and display window * 5. Start Qt event loop to begin responding to user interactions *  * Performance Optimization Explanation: * - Using Fusion style, performs well across platforms * - Dark theme reduces screen brightness, lowering power consumption * - Streamlined startup process for quick usability */int main(int argc, char *argv[]) {    // =======================================    // Create Qt application instance    // =======================================    QApplication app(argc, argv);    // =======================================    // Configure modern dark theme - User experience optimization    // =======================================    /**     * Reason for choosing Fusion style:     * - Good cross-platform consistency, uniform performance on Windows/Linux/macOS     * - Excellent rendering performance, supports hardware acceleration     * - Well-adapted dark theme     * - Relatively low memory usage     */    app.setStyle(QStyleFactory::create("Fusion"));    /**     * Dark theme color scheme design:     * - Main background color: Dark gray (45,45,45) - Eye-friendly and not too dark     * - Text color: White - Ensures contrast and readability       * - Input area background: Darker gray (30,30,30) - Highlights display     * - Button background: Medium gray (60,60,60) - Clear hierarchy     * - Highlight color: Blue - Complies with modern UI design standards     */    QPalette darkPalette;    darkPalette.setColor(QPalette::Window, QColor(45, 45, 45));           // Window background color    darkPalette.setColor(QPalette::WindowText, Qt::white);                // Window text color    darkPalette.setColor(QPalette::Base, QColor(30, 30, 30));            // Input box background color    darkPalette.setColor(QPalette::AlternateBase, QColor(45, 45, 45));    // Alternate row background color    darkPalette.setColor(QPalette::ToolTipBase, Qt::white);               // Tooltip background color    darkPalette.setColor(QPalette::ToolTipText, Qt::white);               // Tooltip text color    darkPalette.setColor(QPalette::Text, Qt::white);                      // Normal text color    darkPalette.setColor(QPalette::Button, QColor(60, 60, 60));          // Button background color    darkPalette.setColor(QPalette::ButtonText, Qt::white);                // Button text color    darkPalette.setColor(QPalette::BrightText, Qt::red);                  // Bright text (error prompt)    darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));          // Link color    darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));      // Selected highlight color    darkPalette.setColor(QPalette::HighlightedText, Qt::black);           // Selected text color    app.setPalette(darkPalette);        // Apply dark theme palette    // =======================================    // Create and display calculator main window    // =======================================    Calculator calculator;              // Create Calculator instance (automatically initializes UI)    calculator.show();                  // Display main window    // =======================================    // Start Qt event loop    // =======================================    /**     * app.exec() starts the main event loop of Qt:     * - Handles user input events (mouse, keyboard)     * - Handles window drawing and update events       * - Handles timer and network events     * - Returns only when the program exits     */    return app.exec();}

2: calculator.h File

/*************************************************************************** * File Name: calculator.h * Program Version: V2.0 High-Performance Optimized Version * Creation Date: January 2025 * Last Modified: January 2025 *  * Project Description: Programmer's high-performance calculator *          Supports binary, octal, decimal, hexadecimal multi-base conversion *          Provides arithmetic operations, bitwise operations, shifts, rotations, and other advanced functions *          Fully supports keyboard and shortcut operations *  * Functional Features: * - Multi-base calculation (BIN/OCT/DEC/HEX) * - Signed/unsigned integer operations * - Real-time bit display and visualization * - Bit operations (left shift, right shift, rotate, flip) * - Arithmetic operations (+, -, *, /, %) * - Bitwise logical operations (&amp;, |, ^, ~) * - Full keyboard support and shortcuts * - High-performance optimized algorithms *  * Performance Optimizations: * - Static caching mechanism reduces redundant calculations * - Memory pre-allocation optimization * - Inline function optimization for critical paths * - Batch UI updates reduce redraws * - Compile-time constant optimizations * * Technical Features: * - Developed based on Qt5/6 framework * - Implemented with C++17 standard * - Modular design * - Object-oriented programming * * Author Information: Vico * Contact Information: QQ Group ***************************************************************************/#ifndef CALCULATOR_H#define CALCULATOR_H// Qt framework header files - Core UI components#include <QWidget>          // Main window base class#include <QGridLayout>      // Grid layout manager#include <QLineEdit>        // Text input control#include <QPushButton>      // Button control#include <QComboBox>        // Drop-down list control#include <QRadioButton>     // Radio button control#include <QButtonGroup>     // Button group manager#include <QLabel>           // Label control#include <QInputDialog>     // Input dialog#include <QHBoxLayout>      // Horizontal layout manager#include <QKeyEvent>        // Keyboard event handling#include <QShortcut>        // Shortcut key support#include <QString>          // Qt string class// C++ standard library header files#include <cmath>            // Math functions#include <bitset>           // Bitset operations#include <climits>          // Numeric limits constants/** * @class Calculator * @brief Main class for the programmer's high-performance calculation tool *  * This is a multi-base calculator designed specifically for programmers, supporting conversions and calculations between binary, octal, decimal, * and hexadecimal, while providing rich bitwise operation features. *  * Main Features: * - Supports real-time conversion and display of 4 bases (BIN/OCT/DEC/HEX) * - Provides arithmetic operations (+,-,*,/,%) and bitwise operations (&amp;,|,^,~) * - Supports left shift, right shift, circular shifts, and other bit operations * - 32-bit integer visualized bit display * - Signed and unsigned number mode switching * - Full keyboard shortcut support * - Highly optimized performance algorithms */class Calculator : public QWidget {    Q_OBJECTpublic:    /**     * @brief Constructor     * @param parent Parent window pointer, default is nullptr     *      * Initializes the calculator interface, sets the default value to hexadecimal unsigned mode,     * creates all UI components and establishes signal-slot connections.     */    explicit Calculator(QWidget *parent = nullptr);private slots:    /**     * @brief Digit button click slot function     * Handles click events for 0-9 and A-F digit buttons, validating input based on the current base     */    void digitClicked();    /**     * @brief Arithmetic operator button click slot function     * Handles click events for +, -, *, /, % operator buttons     */    void operatorClicked();    /**     * @brief Bitwise operator button click slot function     * Handles click events for &amp;, |, ^, ~ bitwise operator buttons     */    void bitwiseOperatorClicked();    /**     * @brief Equals button click slot function     * Executes pending calculation operation and displays the result     */    void equalClicked();    /**     * @brief Clear button click slot function     * Clears the current input value while retaining calculation state     */    void clearClicked();    /**     * @brief Clear All slot function     * Resets the calculator to its initial state, clearing all data     */    void clearAllClicked();    /**     * @brief Base switch slot function     * Responds to changes in the base selection box, updating the display format     */    void changeBase();    /**     * @brief Signed/Unsigned mode switch slot function     * Switches between signed and unsigned 32-bit integer modes     */    void toggleSigned();    /**     * @brief Update display slot function     * Refreshes the main display area and bit display area content     */    void updateDisplay();    /**     * @brief Shift operation slot function     * Handles left shift (<<) and right shift (>>) operations, supporting arithmetic right shift and logical right shift     */    void shiftClicked();    /**     * @brief Bit flip operation slot function     * Flips the bit value at the specified position (0 becomes 1, 1 becomes 0)     */    void toggleBitClicked();    /**     * @brief Circular shift operation slot function     * Handles circular left shift (ROL) and circular right shift (ROR) operations     */    void rotateClicked();private:    // ===========================================    // UI component member variables    // ===========================================    QLineEdit *display;               ///< Main display area, shows current value    QLineEdit *bitDisplay;            ///< Bit display area, shows 32-bit binary representation    QPushButton *digitButtons[16];    ///< Digit button array (0-9,A-F)    QPushButton *operatorButtons[10]; ///< Operator button array (+,-,*,/,%,&amp;,|,^,~,=)    QPushButton *bitwiseButtons[8];   ///< Bit operation button array (<<,>>,ROL,ROR,CLS,CRS,BitTgl,Clear)    QComboBox *baseSelector;          ///< Base selection drop-down box    QRadioButton *signedButton;       ///< Signed mode radio button    QRadioButton *unsignedButton;     ///< Unsigned mode radio button    QLabel *bitLabels[32];           ///< 32 bit labels, visual display of each bit    // ===========================================    // Calculation state member variables    // ===========================================    quint32 currentValue;       ///< Current value (32-bit unsigned integer)    quint32 storedValue;        ///< Stored operand    QString pendingOperator;    ///< Pending operator    int currentBase;           ///< Current base (2,8,10,16)    bool isSigned;             ///< Whether it is signed mode    bool waitingForOperand;    ///< Whether waiting for operand input    // ===========================================    // Operator enumeration constants    // ===========================================    /**     * @brief Operator type enumeration     * Defines all supported operation types     */    enum Operator {        OP_ADD,     ///< Addition operation        OP_SUB,     ///< Subtraction operation        OP_MUL,     ///< Multiplication operation        OP_DIV,     ///< Division operation        OP_MOD,     ///< Modulus operation        OP_AND,     ///< Bitwise AND operation        OP_OR,      ///< Bitwise OR operation        OP_XOR,     ///< Bitwise XOR operation        OP_NOT,     ///< Bitwise NOT operation        OP_LSHIFT,  ///< Left shift operation        OP_RSHIFT   ///< Right shift operation    };    // ===========================================    // Core calculation functions    // ===========================================    /**     * @brief Execute calculation operation     * @param operand Operand     * @param operation Operation type (-1 indicates using the pending operator)     * @return Whether the calculation was successful (returns false on errors like division by zero)     *      * This is the core calculation function of the calculator, handling all arithmetic and bitwise operations,     * including error detection (such as division by zero) and result range limits (32-bit).     */    bool calculate(quint32 operand, int operation);    /**     * @brief Format number display (original version)     * @param value Value to format     * @return Formatted string     *      * Formats the value into a display string based on the current base and sign mode.     * Note: This function is retained for compatibility, actual use is formatNumberOptimized.     */    QString formatNumber(quint32 value) const;    /**     * @brief Update bit display area     *      * Highly optimized bit display update function, using the following optimization techniques:     * - Direct bit operations to generate strings, avoiding QString::number overhead     * - Caching style strings to reduce repeated creation     * - Only updating UI when state changes, reducing redraw times     * - Memory pre-allocation optimization     */    void updateBitDisplay();    // ===========================================    // High-performance inline optimization functions    // ===========================================    /**     * @brief Circular left shift operation (inline optimization)     * @param value Value to shift     * @param positions Number of positions to shift     * @return Result after shifting     *      * Efficient 32-bit circular left shift implementation, using bit operations to avoid loops.     */    inline quint32 rotateBitsLeft(quint32 value, int positions) const;    /**     * @brief Circular right shift operation (inline optimization)     * @param value Value to shift     * @param positions Number of positions to shift     * @return Result after shifting     *      * Efficient 32-bit circular right shift implementation, using bit operations to avoid loops.     */    inline quint32 rotateBitsRight(quint32 value, int positions) const;    /**     * @brief Validate number's validity in specified base (inline optimization)     * @param digit Number to validate     * @param base Base radix     * @return Whether the number is valid     *      * Quickly validates whether the input number is within the valid range for the current base.     */    inline bool isDigitValidForBase(int digit, int base) const;    /**     * @brief Optimized number formatting function     * @param value Value to format     * @return Formatted string     *      * Compared to the original formatNumber, this function uses a lookup table for optimization,     * reducing conditional branches and improving formatting performance.     */    QString formatNumberOptimized(quint32 value) const;    // ===========================================    // UI setup functions - Modular design    // ===========================================    /**     * @brief Set up main user interface     *      * Main UI initialization function, creates layout and calls various sub-module setup functions.     * Adopts a modular design for easier maintenance and expansion.     */    void setupUI();    /**     * @brief Set up control area (base and sign selection)     * @param mainLayout Main layout pointer     *      * Creates base selection drop-down box and signed/unsigned radio button group.     */    void setupControlArea(QGridLayout *mainLayout);    /**     * @brief Set up bit label display area     * @param mainLayout Main layout pointer     *      * Creates 32 bit labels and group titles, providing visual display of bits.     * Uses color coding to distinguish different byte groups.     */    void setupBitLabels(QGridLayout *mainLayout);    /**     * @brief Set up digit button area (0-9,A-F)     * @param mainLayout Main layout pointer     *      * Creates 16 digit buttons, supporting complete hexadecimal input.     * Buttons are arranged in a standard calculator layout.     */    void setupDigitButtons(QGridLayout *mainLayout);    /**     * @brief Set up operator button area     * @param mainLayout Main layout pointer     *      * Creates arithmetic operator and bit operator buttons, using color coding to distinguish function types.     */    void setupOperatorButtons(QGridLayout *mainLayout);    /**     * @brief Set up bit operation button area     * @param mainLayout Main layout pointer     *      * Creates advanced bit operation buttons for shifting, rotating, clearing, etc.     */    void setupBitwiseButtons(QGridLayout *mainLayout);    /**     * @brief Set up keyboard shortcuts     *      * Configures a complete shortcut key system, including:     * - Ctrl+1/2/3/4: Base switching     * - Ctrl+S/U: Signed/unsigned switching     * - Ctrl+Left/Right: Shift operations     * - ESC: Clear all, Del/Backspace: Clear     */    void setupShortcuts();protected:    /**     * @brief Keyboard event handling function (override)     * @param event Keyboard event pointer     *      * Handles keyboard input, supporting:     * - Direct input of digits and hexadecimal characters     * - Operator keyboard input     * - Function key (ESC, Del, etc.) operations     *      * Provides a complete keyboard operation experience, allowing all calculations to be completed without a mouse.     */    void keyPressEvent(QKeyEvent *event) override;};#endif // CALCULATOR_H

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