diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/.keep" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_1.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_1.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..3fc984ca81baf03054f1c8888b9d7a5962800cf8
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_1.cpp"
@@ -0,0 +1,21 @@
+#include <iostream>
+using namespace std;
+
+double Calculate(double x, double y) {
+	return 2.0 * x * y / (x + y);
+}
+
+int main()
+{
+	double a, b;
+
+	while (1) {
+		cout << "请输入两个数：" << endl;
+		cin >> a >> b;
+		if (a == 0 || b == 0)
+			break;
+		cout << "这两个数的调和平均数为：" << Calculate(a, b) << endl;
+	}
+
+	return 0;
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_2.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_2.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..bd7b385d4b04328005732f928dd33deed9813371
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_2.cpp"
@@ -0,0 +1,44 @@
+#include<iostream>
+using namespace std;
+
+int Init(int arr[]);
+void Show(int arr[], int s);
+double Cal(int arr[], int s);
+
+int main() {
+	int arr[10];
+	int size = Init(arr);
+	Show(arr, size);
+	cout << "平均成绩为：" << Cal(arr, size) << endl;
+	return 0;
+}
+
+int Init(int arr[]) {
+	int s = 0;
+	cout << "请输入成绩：（输入-1提前结束输入）" << endl;
+	for (int i = 0; i < 10; i++) {
+		int temp;
+		cin >> temp;
+		if (temp == -1)
+			break;
+		arr[i] = temp;
+		s++;
+	}
+	return s;
+}
+
+void Show(int arr[], int s) {
+	cout << "以下是高尔夫成绩：" << endl;
+	for (int i = 0; i < s; i++) {
+		cout << arr[i] << " ";
+	}
+	cout << endl;
+}
+
+double Cal(int arr[], int s) {
+	double sum = 0;
+	for (int i = 0; i < s; i++) {
+		sum += arr[i];
+	}
+	return sum / s;
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_3.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_3.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..636a24dc0e785991ae9594b7f4077df6735f6e79
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_3.cpp"
@@ -0,0 +1,40 @@
+#include<iostream>
+using namespace std;
+
+struct box {
+	char maker[40];
+	float height;
+	float width;
+	float length;
+	float volume;
+};
+
+void Init(box* b);
+void Show(const box* b);
+void SetVolume(box* b);
+
+int main() {
+	box B;
+	Init(&B);
+	SetVolume(&B);
+	Show(&B);
+	return 0;
+}
+
+void Init(box* b) {
+	cout << "请输入这个box的名称：";
+	cin >> b->maker;
+	cout << endl << "请分别输入这个box的高宽长：";
+	cin >> b->height >> b->width >> b->length;
+	cout << endl;
+}
+
+void Show(const box* b) {
+	cout << "这个box的名称为：" << b->maker << endl;
+	cout << "这个box的高宽长分别为：" << b->height << " " << b->width << " " << b->length << endl;
+	cout << "这个box的体积为：" << b->volume << endl;
+}
+
+void SetVolume(box* b) {
+	b->volume = b->height * b->width * b->length;
+}
\ No newline at end of file
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_4.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_4.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..8072e6464fde787541b7d53c0ab5bf854fe024fb
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_4.cpp"
@@ -0,0 +1,30 @@
+#include <iostream>
+
+long double probability(unsigned numbers, unsigned picks);
+
+int main()
+{
+	using namespace std;
+	double total1, choices1, total2, choices2;
+	cout << "请分别输入两组数：";
+	while ((cin >> total1 >> choices1) && (cin >> total2 >> choices2) && choices1 <= total1 && choices2 <= total2)
+	{
+		cout << "You have one chance in ";
+		cout << probability(total1, choices1) * probability(total2, choices2);  // compute the odds
+		cout << " of winning.\n";
+		cout << "Next two numbers (q to quit): ";
+	}
+	cout << "bye\n";
+	return 0;
+}
+
+long double probability(unsigned numbers, unsigned picks)
+{
+	long double result = 1.0;  // here come some local variables
+	long double n;
+	unsigned p;
+
+	for (n = numbers, p = picks; p > 0; n--, p--)
+		result = result * n / p;
+	return result;
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_5.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_5.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..cda1e85bbd243bdb00701839a9471241b0a5e834
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_5.cpp"
@@ -0,0 +1,22 @@
+#include<iostream>
+using namespace std;
+
+int Jiecheng(int x);
+
+int main() {
+	int n;
+	while (1) {
+		cout << "请输入一个数：";
+		cin >> n;
+		cout << n << "的阶乘为：" << Jiecheng(n) << endl;
+	}
+
+	return 0;
+}
+
+int Jiecheng(int x) {
+	if (x == 0)
+		return 1;
+	return x * Jiecheng(x - 1);
+
+}
\ No newline at end of file
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_6.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_6.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..d18a96b58f0fdc5c188f1717580d185ee9b265cf
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_6.cpp"
@@ -0,0 +1,61 @@
+#include<iostream>
+using namespace std;
+
+int Fill_array(double a[], int s);
+void Show_array(double a[], int s);
+void Reverse_array(double a[], int s);
+
+int main() {
+	int size;
+	cout << "输入数组的长度：";
+	cin >> size;
+	double* arr = new double[size];
+	int cnt = Fill_array(arr, size);
+	cout << "实际输入了" << cnt << "个数" << endl;
+	Show_array(arr, cnt);
+	Reverse_array(arr, cnt);
+	cout << "反转数组：" << endl;
+	Show_array(arr, cnt);
+	return 0;
+}
+
+int Fill_array(double a[], int s) {
+	int len = 0;
+	double t;
+	cout << "请输入数字：";
+	while (s--) {
+		if (cin >> t) {
+			a[len++] = t;
+		}
+		else
+			break;
+	}
+
+	return len;
+}
+
+void Show_array(double a[], int s) {
+	for (int i = 0; i < s; i++) {
+		cout << a[i] << " ";
+	}
+	cout << endl;
+}
+
+void Reverse_array(double a[], int s) {
+	if (s % 2 == 0) {
+		int k = (s - 2) / 2;
+		for (int i = 1; i <= k; i++) {
+			double temp = a[i];
+			a[i] = a[s - 1 - i];
+			a[s - 1 - i] = temp;
+		}
+	}
+	else {
+		int k = s / 2;
+		for (int i = 1; i < k; i++) {
+			double temp = a[i];
+			a[i] = a[s - 1 - i];
+			a[s - 1 - i] = temp;
+		}
+	}
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_7.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_7.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..9c5096a73a6d27d36ad5ea13473b0f5a5f404e8b
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_7.cpp"
@@ -0,0 +1,81 @@
+#include <iostream>
+const int Max = 5;
+
+// function prototypes
+double* fill_array(double ar[]);
+void show_array(const double* begin, const double* end); // don't change data
+void revalue(double r, double* begin, double* end);
+
+
+int main()
+{
+	using namespace std;
+	double properties[Max];
+
+	double* last = fill_array(properties);	//last是指向数组末尾的指针
+
+	show_array(properties, last);
+	if (last > properties)
+	{
+		cout << "Enter revaluation factor: ";
+		double factor;
+		while (!(cin >> factor)) // bad input
+		{
+			cin.clear();
+			while (cin.get() != '\n')
+				continue;
+			cout << "Bad input; Please enter a number: ";
+		}
+		revalue(factor, properties, last);
+		show_array(properties, last);
+	}
+	cout << "Done.\n";
+	cin.get();
+	cin.get();
+	return 0;
+}
+
+double* fill_array(double ar[])
+{
+	using namespace std;
+	double temp;
+	int i;
+	for (i = 0; i < Max; i++)
+	{
+		cout << "Enter value #" << (i + 1) << ": ";
+		cin >> temp;
+		if (!cin) // bad input
+		{
+			cin.clear();
+			while (cin.get() != '\n')
+				continue;
+			cout << "Bad input; input process terminated.\n";
+			break;
+		}
+		else if (temp < 0) // signal to terminate
+			break;
+		ar[i] = temp;
+	}
+	return ar + i;
+}
+
+// the following function can use, but not alter,
+// the array whose address is ar
+void show_array(const double* begin, const double* end)
+{
+	using namespace std;
+	const double* pt;
+	int i = 1;
+	for (pt = begin; pt != end; pt++) {
+		cout << "Property #" << i++ << ": $";
+		cout << *pt << endl;
+	}
+}
+
+// multiplies each element of ar[] by r
+void revalue(double r, double* begin, double* end)
+{
+	double* pt;
+	for (pt = begin; pt != end; pt++)
+		*pt *= r;
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_8.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_8.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..21ca8823aef68bdca461792a2b1da5272fe78e3c
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_8.cpp"
@@ -0,0 +1,79 @@
+//版本2
+#include<iostream>
+#include<string>
+using namespace std;
+
+const int Seasons = 4;
+const char* Snames[] = { "Spring", "Summer", "Fall", "Winter" };
+
+struct S_exp {
+	double expense[4];
+};
+
+void fill(S_exp& s);
+void show(S_exp& s);
+
+int main() {
+	S_exp s;
+	fill(s);
+	show(s);
+
+
+	return 0;
+}
+
+void fill(S_exp& s) {
+	for (int i = 0; i < Seasons; i++) {
+		cout << "Enter " << Snames[i] << " expenses: ";
+		cin >> s.expense[i];
+	}
+}
+
+void show(S_exp& s) {
+	double total = 0.0;
+	cout << "EXPENSES" << endl;
+	for (int i = 0; i < Seasons; i++) {
+		cout << Snames[i] << ": $" << s.expense[i] << endl;
+		total += s.expense[i];
+	}
+	cout << "Total Expenses: $" << total << endl;
+}
+
+//版本1
+/*
+#include<iostream>
+#include<string>
+using namespace std;
+
+const int Seasons = 4;
+const char* Snames[] = { "Spring", "Summer", "Fall", "Winter" };
+
+void fill(double a[]);
+void show(double a[]);
+
+int main() {
+	double expense[4];
+	fill(expense);
+	show(expense);
+
+
+	return 0;
+}
+
+void fill(double a[]) {
+	for (int i = 0; i < Seasons; i++) {
+		cout << "Enter " << Snames[i] << " expenses: ";
+		cin >> a[i];
+	}
+}
+
+void show(double a[]) {
+	double total = 0.0;
+	cout << "EXPENSES" << endl;
+	for (int i = 0; i < Seasons; i++) {
+		cout << Snames[i] << ": $" << a[i] << endl;
+		total += a[i];
+	}
+	cout << "Total Expenses: $" << total << endl;
+}
+*/
\ No newline at end of file
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_9.cpp" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_9.cpp"
new file mode 100644
index 0000000000000000000000000000000000000000..12e11688f096a7ddc419ab7981120c0cbd70dae0
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/7_9.cpp"
@@ -0,0 +1,72 @@
+#include <iostream>
+#include<cstring>
+#include<string>
+using namespace std;
+
+const int SLEN = 30;
+
+struct student {
+	char fullname[SLEN];
+	char hobby[SLEN];
+	int ooplevel;
+};
+
+int getinfo(student pa[], int n);
+void display1(student st);
+void display2(const student* ps);
+void display3(const student pa[], int n);
+
+int main()
+{
+	cout << "Enter class size: ";
+	int class_size;
+	cin >> class_size;
+
+	while (cin.get() != '\n')
+		continue;
+
+	student* ptr_stu = new student[class_size];
+	int entered = getinfo(ptr_stu, class_size);
+	for (int i = 0; i < entered; i++)
+	{
+		display1(ptr_stu[i]);
+		display2(&ptr_stu[i]);
+	}
+	display3(ptr_stu, entered);
+	delete[] ptr_stu;
+	cout << "Done\n";
+	return 0;
+}
+
+int getinfo(student pa[], int n) {
+	int i;
+	for (i = 0; i < n; i++) {
+		cout << "请输入学生的姓名：";
+		cin.getline(pa[i].fullname, SLEN);
+		if (strlen(pa[i].fullname) == 0) //输入空行则暂停
+			break;
+		cout << "请输入学生的兴趣：";
+		cin.getline(pa[i].hobby, SLEN);
+		cout << "请输入学生的ooplevel：";
+		cin >> pa[i].ooplevel;
+		cin.get();
+	}
+	return i;
+}
+
+void display1(student st) {
+	cout << "display1" << endl;
+	cout << "姓名：" << st.fullname << " 兴趣：" << st.hobby << " ooplevel：" << st.ooplevel << endl;
+}
+
+void display2(const student* ps) {
+	cout << "display2" << endl;
+	cout << "姓名：" << ps->fullname << " 兴趣：" << ps->hobby << " ooplevel：" << ps->ooplevel << endl;
+
+}
+void display3(const student pa[], int n) {
+	cout << "display3" << endl;
+	for (int i = 0; i < n; i++) {
+		cout << "姓名：" << pa[i].fullname << " 兴趣：" << pa[i].hobby << " ooplevel：" << pa[i].ooplevel << endl;
+	}
+}
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/CMakeLists.txt" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/CMakeLists.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..2a1d14c9e217b39327f1922d3b9b49da52d1f17f
--- /dev/null
+++ "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/C++PrimerPlus/Chapter7/CMakeLists.txt"
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.0)
+project(Chapter7)
+
+# 定义所有的源文件
+set(SOURCES
+    7_1.cpp
+    7_2.cpp
+    7_3.cpp
+    7_4.cpp
+    7_5.cpp
+    7_6.cpp
+    7_7.cpp
+    7_8.cpp
+    7_9.cpp
+)
+
+# 为每个源文件生成一个可执行文件
+foreach(SOURCE ${SOURCES})
+    get_filename_component(EXE_NAME ${SOURCE} NAME_WE)
+    add_executable(${EXE_NAME} ${SOURCE})
+endforeach()
diff --git "a/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/test.txt" "b/C++/codes/2024-07/\350\213\217\345\235\232\350\215\243/test.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391