diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main"
new file mode 100755
index 0000000000000000000000000000000000000000..453aea2dca68c8f74e126c7488a71a96c8042e57
Binary files /dev/null and "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main" differ
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..4b2db05a179ad88c68cb2b23fb52f0dedbec34dd
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/main.cpp"
@@ -0,0 +1,43 @@
+#include <iostream>
+#include <cstring>
+#include "stack.hpp"
+
+typedef customer Item;  
+
+int main() {
+    Stack stack;
+    Item cust;
+    double totalPayment = 0.0;
+    char input[35];
+
+    while (true) {
+        std::cout << "Enter fullname (or 'q' to quit): ";
+        std::cin.getline(input, 35);
+
+        if (strcmp(input, "q") == 0) {
+            break;
+        }
+
+        strcpy(cust.fullname, input);
+
+        std::cout << "Enter payment: ";
+        std::cin >> cust.payment;
+         std::cin.ignore();  // 忽略cin保留的换行符
+
+        if (stack.push(cust)) {
+            std::cout << "Customer added to stack.\n";
+        } else {
+            std::cout << "Failed to add customer.\n";
+        }
+    }
+
+    while (!stack.isempty()) {
+        stack.pop(cust);
+        totalPayment += cust.payment;
+        std::cout << "Removed customer: " << cust.fullname << ", Payment: " << cust.payment << "\n";
+    }
+
+    std::cout << "Total payment: " << totalPayment << std::endl;
+
+    return 0;
+}
\ No newline at end of file
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/stack.hpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/stack.hpp"
new file mode 100644
index 0000000000000000000000000000000000000000..3b7e04b2076854a8076c335753a7831c359c2a60
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.5/stack.hpp"
@@ -0,0 +1,51 @@
+
+struct customer {
+    char fullname[35];
+    double payment;
+};
+
+typedef customer Item; 
+
+class Stack {
+
+private:
+    enum { MAX = 10 };    
+    Item items[MAX];      
+    int top;              
+
+public:
+    Stack();
+    bool isempty() const;
+    bool isfull() const;
+    bool push(const Item & item);  
+    bool pop(Item & item);          
+};
+
+Stack::Stack() {
+    top = 0;
+}
+
+bool Stack::isempty() const {
+    return top == 0;
+}
+
+bool Stack::isfull() const {
+    return top == MAX;
+}
+
+bool Stack::push(const Item & item) {
+    if (top < MAX) {
+        items[top++] = item;
+        return true;
+    } else
+        return false;
+}
+
+bool Stack::pop(Item & item) {
+    if (top > 0) {
+        item = items[--top];
+        return true;
+    } else
+        return false;
+}
+
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/Move.hpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/Move.hpp"
new file mode 100644
index 0000000000000000000000000000000000000000..5e2d4055988772b0eba04e8e3288762d4a0978a0
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/Move.hpp"
@@ -0,0 +1,46 @@
+#ifndef MOVE_HPP
+#define MOVE_HPP
+
+#include <iostream>
+
+class Move {
+private:
+    double x; 
+    double y; 
+
+public:
+   
+    Move(double a = 0, double b = 0);
+
+   
+    void showmove() const;
+
+  
+    Move add(const Move &m) const;
+
+   
+    void reset(double a = 0, double b = 0);
+};
+
+
+Move::Move(double a, double b) : x(a), y(b) {}
+
+void Move::showmove() const {
+    
+    std::cout << "Current x: " << x << ", Current y: " << y << std::endl;
+}
+
+
+Move Move::add(const Move &m) const {
+    
+    return Move(x + m.x, y + m.y); 
+}
+
+
+void Move::reset(double a, double b) {
+   
+    x = a;
+    y = b;
+}
+
+#endif
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main"
new file mode 100755
index 0000000000000000000000000000000000000000..643a3b55cdb27e00c219ff6fe775e2096750f95d
Binary files /dev/null and "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main" differ
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..7ee44ca5f9a8ca6f2a5c38fdf4419508d83076da
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter10/10.6/main.cpp"
@@ -0,0 +1,21 @@
+#include "Move.hpp"
+
+int main() {
+   
+    Move move1(3, 4);
+    move1.showmove(); 
+
+    
+    Move move2(2, 6);
+    move2.showmove(); 
+
+    
+    Move move3 = move1.add(move2);
+    move3.showmove(); 
+
+    
+    move1.reset(0, 0);
+    move1.showmove(); 
+
+    return 0;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/main.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/main.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..652279247103f85421a7253b5374cdec1a15e5c9
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/main.cpp"
@@ -0,0 +1,59 @@
+#include <iostream>
+#include "vector.h"
+#include <cstdlib>     
+#include <ctime>  
+#include <climits>     
+
+int main() {
+    using namespace std;
+    using VECTOR::Vector;
+    srand(time(0));     
+
+    double direction;
+    Vector step;
+    Vector result(0.0, 0.0);
+    unsigned long steps;
+    double target;
+    double dstep;
+    int numTests;
+
+    cout << "Enter the number of tests: ";
+    cin >> numTests;
+
+    cout << "Enter target distance (q to quit): ";
+    while (cin >> target) {
+        cout << "Enter step length: ";
+        if (!(cin >> dstep))
+            break;
+
+        unsigned long maxSteps = 0;
+        unsigned long minSteps = ULONG_MAX;
+        unsigned long totalSteps = 0;
+
+        for (int i = 0; i < numTests; ++i) {
+            result.reset(0.0, 0.0);
+            steps = 0;
+            while (result.magval() < target) {
+                direction = rand() % 360;
+                step.reset(dstep, direction, Vector::POL);
+                result = result + step;
+                steps++;
+            }
+
+            if (steps > maxSteps)
+                maxSteps = steps;
+            if (steps < minSteps)
+                minSteps = steps;
+            totalSteps += steps;
+        }
+
+        cout << "After " << numTests << " tests:\n";
+        cout << "Maximum steps: " << maxSteps << endl;
+        cout << "Minimum steps: " << minSteps << endl;
+        cout << "Average steps: " << (double)totalSteps / numTests << endl;
+
+        cout << "Enter target distance (q to quit): ";
+    }
+    cout << "Bye!\n";
+    return 0;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..8b1e3dfbfacf277a15792834329c55f452c42bcc
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.cpp"
@@ -0,0 +1,130 @@
+// vector.cpp -- methods for the Vector class
+#include <cmath>
+#include "vector.h" // includes <iostream>
+
+using std::sqrt;
+using std::sin;
+using std::cos;
+using std::atan;
+using std::atan2;
+using std::cout;
+
+namespace VECTOR {
+
+    // compute degrees in one radian
+    const double Rad_to_deg = 45.0 / atan(1.0);
+    
+    void Vector ::set_mag() {
+        mag = sqrt(x * x + y * y);
+
+    }
+
+    void Vector::set_ang() {
+        if (x == 0.0 && y == 0.00)
+            ang = 0.0;
+        else
+            ang = atan2(y, x);
+    }
+
+    // default constructor
+    Vector::Vector() {
+        x = y = mag =ang = 0.0;
+        mode = RECT;
+    }
+
+    // construct vector from rectangular coordinates if form is RECT (the default)
+    // or else from polar coordinates if form is POL
+    Vector::Vector(double n1, double n2, Mode form) {
+        mode = form;
+        if (form == RECT) {
+            x = n1;
+            y = n2;
+            set_mag();
+            set_ang();
+        } else if (form == POL) {
+            double mag = n1;
+            double ang = n2 / Rad_to_deg;
+            x = mag * cos(ang);
+            y = mag * sin(ang);
+        } else {
+            cout << "Incorrect 3rd argument to Vector() -- vector set to 0\n";
+            x = y = mag = ang = 0.0;
+            mode = RECT;
+        }
+    }
+
+    // reset vector from rectangular coordinates if form is RECT (the default)
+    // or else from polar coordinates if form is POL
+    void Vector::reset(double n1, double n2, Mode form) {
+        mode = form;
+        if (form == RECT) {
+            x = n1;
+            y = n2;
+            set_mag();
+            set_ang();
+        } else if (form == POL) {
+            double mag = n1;
+            double ang = n2 / Rad_to_deg;
+            x = mag * cos(ang);
+            y = mag * sin(ang);
+        } else {
+            cout << "Incorrect 3rd argument to Vector() -- vector set to 0\n";
+            x = y = mag = ang =0.0;
+            mode = RECT;
+        }
+    }
+
+    Vector::~Vector() {
+    }
+
+    // set to polar mode
+    void Vector::polar_mode() {
+        mode = POL;
+    }
+
+    // set to rectangular mode
+    void Vector::rect_mode() {
+        mode = RECT;
+    }
+
+    // operator overloading
+    // add two Vectors
+    Vector Vector::operator+(const Vector & b) const {
+        return Vector(x + b.x, y + b.y);
+    }
+
+    // subtract Vector b from a
+    Vector Vector::operator-(const Vector & b) const {
+        return Vector(x - b.x, y - b.y);
+    }
+
+    // reverse sign of Vector
+    Vector Vector::operator-() const {
+        return Vector(-x, -y);
+    }
+
+    // multiply vector by n
+    Vector Vector::operator*(double n) const {
+        return Vector(n * x, n * y);
+    }
+
+    // friend methods
+    // multiply n by Vector a
+    Vector operator*(double n, const Vector & a) {
+        return a * n;
+    }
+
+    // display rectangular coordinates if mode is RECT,
+    // else display polar coordinates if mode is POL
+    std::ostream & operator<<(std::ostream & os, const Vector & v) {
+        if (v.mode == Vector::RECT)
+            os << "(x,y) = (" << v.x << ", " << v.y << ")";
+        else if (v.mode == Vector::POL)
+            os << "(m,a) = (" << v.magval() << ", "
+               << v.angval() * Rad_to_deg << ")";
+        else
+            os << "Vector object mode is invalid";
+        return os;
+    }
+
+} // namespace VECTOR
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.h" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.h"
new file mode 100644
index 0000000000000000000000000000000000000000..ce7513966456ac334d535eff444f1155097d89c9
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.3/vector.h"
@@ -0,0 +1,43 @@
+#ifndef VECTOR_H_
+#define VECTOR_H_
+
+#include <iostream>
+#include <cmath>
+
+namespace VECTOR {
+    class Vector {
+    public:
+        enum Mode { RECT, POL };
+    private:
+        double x;      // horizontal value
+        double y;      // vertical value
+        double mag;
+        double ang;
+        Mode mode;     // RECT or POL
+        // private methods for setting values
+        void set_mag();
+        void set_ang();
+        
+    public:
+        Vector();
+        Vector(double n1, double n2, Mode form = RECT);
+        void reset(double n1, double n2, Mode form = RECT);
+        ~Vector();
+        double xval() const { return x; }       // report x value
+        double yval() const { return y; }       // report y value
+        double magval() const {return mag;}                 // report magnitude
+        double angval() const {return ang;}                  // report angle
+        void polar_mode();                      // set mode to POL
+        void rect_mode();                       // set mode to RECT
+        // operator overloading
+        Vector operator+(const Vector & b) const;
+        Vector operator-(const Vector & b) const;
+        Vector operator-() const;
+        Vector operator*(double n) const;
+        // friends
+        friend Vector operator*(double n, const Vector & a);
+        friend std::ostream & operator<<(std::ostream & os, const Vector & v);
+    };
+}  // namespace VECTOR
+
+#endif // VECTOR_H_
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/main.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/main.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..89b8abfcfa4c47e60ccd1332994e54d9aafc9845
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/main.cpp"
@@ -0,0 +1,21 @@
+#include <iostream>
+#include "mytime3.h"
+
+int main() {
+    Time t1(1, 30);  
+    Time t2(5, 40);  
+
+    std::cout << "Time 1: " << t1 << std::endl;
+    std::cout << "Time 2: " << t2 << std::endl;
+
+    Time t3 = t1 + t2;
+    std::cout << "Sum: " << t3 << std::endl;
+
+    Time t4 = t1 - t2;
+    std::cout << "Difference: " << t4 << std::endl;
+
+    Time t5 = t1 * 2.5;  
+    std::cout << "Time 1 multiplied by 3: " << t5 << std::endl;
+
+    return 0;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..5547210c0327b9a67cb1c51a2e2c7d0e415945e3
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.cpp"
@@ -0,0 +1,85 @@
+#include "mytime3.h"
+
+ 
+Time::Time() : hours(0), minutes(0) {}
+
+ 
+Time::Time(int h, int m) : hours(h), minutes(m) {
+    while (minutes >= 60) {
+        hours++;
+        minutes -= 60;
+    }
+    while (minutes < 0) {
+        hours--;
+        minutes += 60;
+    }
+    if (hours < 0) hours = 0;  
+}
+
+ 
+void Time::AddMin(int m) {
+    minutes += m;
+    while (minutes >= 60) {
+        hours++;
+        minutes -= 60;
+    }
+}
+
+ 
+void Time::AddHr(int h) {
+    hours += h;
+}
+
+ 
+void Time::Reset(int h, int m) {
+    hours = h;
+    minutes = m;
+    while (minutes >= 60) {
+        hours++;
+        minutes -= 60;
+    }
+    while (minutes < 0) {
+        hours--;
+        minutes += 60;
+    }
+    if (hours < 0) hours = 0;  
+}
+
+ 
+Time operator+(const Time& t1, const Time& t2) {
+    Time sum;
+    sum.minutes = t1.minutes + t2.minutes;
+    sum.hours = t1.hours + t2.hours + sum.minutes / 60;
+    sum.minutes %= 60;
+    return sum;
+}
+
+ 
+Time operator-(const Time& t1, const Time& t2) {
+    Time diff;
+    int total1 = t1.minutes + 60 * t1.hours;
+    int total2 = t2.minutes + 60 * t2.hours;
+    diff.minutes = (total1 - total2) % 60;
+    diff.hours = (total1 - total2) / 60;
+    return diff;
+}
+
+ 
+Time operator*(double n, const Time& t) {
+    Time result;
+    long totalMinutes = t.hours * n * 60 + t.minutes * n;
+    result.hours = totalMinutes / 60;
+    result.minutes = totalMinutes % 60;
+    return result;
+}
+
+ 
+Time operator*(const Time& t, double n) {
+    return n * t;  
+}
+
+ 
+std::ostream& operator<<(std::ostream& os, const Time& t) {
+    os << t.hours << " hours, " << t.minutes << " minutes";
+    return os;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.h" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.h"
new file mode 100644
index 0000000000000000000000000000000000000000..7d644f67a8f19ce29ab7def43662af8bcb072ff2
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter11/11.4/mytime3.h"
@@ -0,0 +1,26 @@
+#ifndef MYTIME3_H
+#define MYTIME3_H
+
+#include <iostream>
+
+class Time {
+private:
+    int hours;    
+    int minutes;  
+
+public:
+    Time();  
+    Time(int h, int m = 0);  
+
+    void AddMin(int m);  
+    void AddHr(int h);   
+    void Reset(int h = 0, int m = 0);  
+
+    friend Time operator+(const Time& t1, const Time& t2);  
+    friend Time operator-(const Time& t1, const Time& t2);  
+    friend Time operator*(double n, const Time& t);  
+    friend Time operator*(const Time& t, double n);  
+    friend std::ostream& operator<<(std::ostream& os, const Time& t);  
+};
+
+#endif  
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.3.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.3.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..40963ad86ce2e3882596a8e05057f925b70d9877
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.3.cpp"
@@ -0,0 +1,31 @@
+#include <iostream>
+#include <new>  
+#include <cstring>  
+
+using namespace std;
+
+struct chaff {
+    char dross[20];
+    int slag;
+};
+
+int main() {
+    
+    char buffer[sizeof(chaff) * 2];
+    chaff* chaffs = new (buffer) chaff[2];
+
+    
+    strcpy(chaffs[0].dross, "chaff1");
+    chaffs[0].slag = 10;
+    strcpy(chaffs[1].dross, "chaff2");
+    chaffs[1].slag = 15;
+
+    
+    for (int i = 0; i < 2; i++) {
+        cout << "chaffs[" << i << "]:";
+        cout << "  dross: " << chaffs[i].dross;
+        cout << "  slag: " << chaffs[i].slag << endl;
+    }
+
+    return 0;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/9.4" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/9.4"
new file mode 100755
index 0000000000000000000000000000000000000000..7fa2d70aaa53308856d2c00147ae7f4abf7b1493
Binary files /dev/null and "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/9.4" differ
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/main.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/main.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..bc71208ba9b79805e55bc1560939b6b164e14ec7
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/main.cpp"
@@ -0,0 +1,23 @@
+// main.cpp
+#include <iostream>
+#include "sales.h"
+
+using  namespace SALES;
+
+int main(){
+    Sales s1, s2;
+
+    setSales(s1);
+
+    const double salesData[QUARTERS] = {300.0, 500.0, 250.0, 300.0};
+    setSales(s2, salesData, QUARTERS);
+
+    std::cout << "Sales for s1:" << std::endl;
+    showSales(s1);
+    std::cout << std::endl;
+
+    std::cout << "Sales for s2:" << std::endl;
+    showSales(s2);
+
+    return 0;
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.cpp" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..0f867240981bbb1aff90217c56f5a72b30e1398b
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.cpp"
@@ -0,0 +1,60 @@
+// sales.cpp
+#include <iostream>
+#include "sales.h"
+
+namespace SALES{
+
+    using std::cin;
+    using std::cout;
+    using std::endl;
+
+    void setSales(Sales &s, const double ar[], int n){
+        
+        int a = n < QUARTERS ? n : QUARTERS;
+        double sum = 0.0;
+        s.max = s.min = ar[0];
+        
+        for (int i = 0; i < a ; i++){
+            s.sales[i] = ar[i];
+            sum += ar[i];
+            if (ar[i] > s.max)
+                s.max = ar[i];
+            if (ar[i] < s.min)
+                s.min = ar[i];
+        }
+        
+        for (int i = a; i < QUARTERS; i++){
+            s.sales[i] = 0.0;
+        }
+        
+        s.average = sum / n;
+    }
+
+    void setSales(Sales &s){
+        
+        double sum = 0.0;
+        cout << "Please enter sales for 4 quarters:" << endl;
+        
+        for (int i = 0; i < QUARTERS; i++){
+            cout << "Quarter " << (i + 1) << ": ";
+            cin >> s.sales[i];
+            sum += s.sales[i];
+            if (i == 0 || s.sales[i] > s.max)
+                s.max = s.sales[i];
+            if (i == 0 || s.sales[i] < s.min)
+                s.min = s.sales[i];
+        }
+        s.average = sum / QUARTERS;
+    }
+
+    void showSales(const Sales &s){
+        cout << "Sales: ";
+        for (int i = 0; i < QUARTERS; i++){
+            cout << s.sales[i] << " ";
+        }
+        cout << endl;
+        cout << "Average: " << s.average << endl;
+        cout << "Max: " << s.max << endl;
+        cout << "Min: " << s.min << endl;
+    }
+}
diff --git "a/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.h" "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.h"
new file mode 100644
index 0000000000000000000000000000000000000000..2cdf13d37787b76411817664b8b54a18c5fc4d56
--- /dev/null
+++ "b/C++/codes/2024-07/\345\210\230\350\260\246/C++PrimerPlusExercises/Chapter9/9.4/sales.h"
@@ -0,0 +1,22 @@
+namespace SALES
+{
+    const int QUARTERS = 4;
+    
+    struct Sales
+    {
+        double sales[QUARTERS];
+        double average;
+        double max;
+        double min;
+    };
+
+    // 从数组 ar 中复制最多 4 项到 s 的 sales 成员中，并计算和存储输入项目的平均值、最大值和最小值；
+    // 如果 sales 中有剩余元素，则将其设置为 0
+    void setSales(Sales &s, const double ar[], int n);
+
+    // 交互式地收集 4 个季度的销售数据，存储在 s 的 sales 成员中，并计算和存储其平均值、最大值和最小值
+    void setSales(Sales &s);
+
+    // 显示结构 s 中的所有信息
+    void showSales(const Sales &s);
+}