diff --git a/作业2.8.c b/作业2.8.c
new file mode 100644
index 0000000..61e156e
--- /dev/null
+++ b/作业2.8.c
@@ -0,0 +1,154 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// ¶¨ÒåѧÉú½á¹¹Ìå
+struct Student {
+    char id[20];
+    char clas[20];
+    char name[20];
+    double score1;
+    double score2;
+    double score3;
+    double score;
+};
+
+// È«¾ÖѧÉúÊý×é
+struct Student* students[100];
+int studentCount = 0;
+
+// ²Ëµ¥º¯Êý
+void printMenu() {
+    printf("1. Input\n");
+    printf("2. Delete\n");
+    printf("3. Select\n");
+    printf("4. Order\n");
+    printf("5. Output\n");
+    printf("6. Quit\n");
+    printf("Please input your option: ");
+}
+
+// ѧÉúÐÅϢ¼È뺯Êý
+void inputStudent() {
+    if (studentCount < 100) {
+        struct Student* student = (struct Student*)malloc(sizeof(struct Student));
+        printf("Id: ");
+        scanf("%s", student->id);
+        printf("Class: ");
+        scanf("%s", student->clas);
+        printf("Name: ");
+        scanf("%s", student->name);
+        printf("Score1: ");
+        scanf("%lf", &student->score1);
+        printf("Score2: ");
+        scanf("%lf", &student->score2);
+        printf("Score3: ");
+        scanf("%lf", &student->score3);
+        student->score = student->score1 + student->score2 + student->score3;
+        students[studentCount++] = student;
+    } else {
+        printf("Student database is full!\n");
+    }
+}
+
+// ѧÉúÐÅϢɾ³ýº¯Êý
+void deleteStudent() {
+    char deleteId[20];
+    printf("Enter student ID or name to delete: ");
+    scanf("%s", deleteId);
+
+    int deleted = 0;
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i]->id, deleteId) == 0 || strcmp(students[i]->name, deleteId) == 0) {
+            free(students[i]);
+            for (int j = i; j < studentCount - 1; j++) {
+                students[j] = students[j + 1];
+            }
+            studentCount--;
+            deleted = 1;
+            i--;
+        }
+    }
+
+    if (deleted == 0) {
+        printf("Student not found.\n");
+    }
+}
+
+// ѧÉúÐÅÏ¢²éѯº¯Êý
+void selectStudent() {
+    char query[20];
+    printf("Enter student ID or class to select: ");
+    scanf("%s", query);
+
+    int found = 0;
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i]->id, query) == 0 || strcmp(students[i]->clas, query) == 0) {
+            printf("%s, %s, %s, %.1lf, %.1lf, %.1lf, %.1lf\n", students[i]->id, students[i]->clas, students[i]->name, students[i]->score1, students[i]->score2, students[i]->score3, students[i]->score);
+            found = 1;
+        }
+    }
+
+    if (found == 0) {
+        printf("There is no eligible student.\n");
+    }
+}
+
+// ѧÉúÐÅÏ¢ÅÅÐòº¯Êý
+void orderStudents() {
+    for (int i = 0; i < studentCount; i++) {
+        for (int j = i + 1; j < studentCount; j++) {
+            if (strcmp(students[i]->clas, students[j]->clas) > 0 || (strcmp(students[i]->clas, students[j]->clas) == 0 && students[i]->score < students[j]->score)) {
+                struct Student* temp = students[i];
+                students[i] = students[j];
+                students[j] = temp;
+            }
+        }
+    }
+}
+
+// ѧÉúÐÅÏ¢Êä³öº¯Êý
+void outputStudents() {
+    for (int i = 0; i < studentCount; i++) {
+        printf("%s, %s, %s, %.1lf, %.1lf, %.1lf, %.1lf\n", students[i]->id, students[i]->clas, students[i]->name, students[i]->score1, students[i]->score2, students[i]->score3, students[i]->score);
+    }
+}
+
+int main() {
+    int option;
+    do {
+        printMenu();
+        scanf("%d", &option);
+        switch (option) {
+            case 1:
+                inputStudent();
+                break;
+            case 2:
+                deleteStudent();
+                break;
+            case 3:
+                selectStudent();
+                break;
+            case 4:
+                orderStudents();
+                outputStudents();
+                break;
+            case 5:
+                outputStudents();
+                break;
+            case 6:
+                // Í˳ö³ÌÐò
+                break;
+            default:
+                printf("Invalid option. Please try again.\n");
+        }
+    } while (option != 6);
+
+    // ÊÍ·ÅÄÚ´æ
+    for (int i = 0; i < studentCount; i++) {
+        free(students[i]);
+    }
+
+    return 0;
+}
+