diff --git a/学籍管理系统4.cpp b/学籍管理系统4.cpp
new file mode 100644
index 0000000..8dfc109
--- /dev/null
+++ b/学籍管理系统4.cpp
@@ -0,0 +1,101 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// 定义学生结构体，包含学号、班级和三门课程成绩
+typedef struct Student {
+    int id;
+    int class_num;
+    double score1;
+    double score2;
+    double score3;
+} Student;
+
+// 交换两个学生结构体的函数
+void swap(Student *a, Student *b) {
+    Student temp = *a;
+    *a = *b;
+    *b = temp;
+}
+
+// 计算学生的总成绩
+double getTotalScore(const Student *s) {
+    return s->score1 + s->score2 + s->score3;
+}
+
+// 插入新学生信息到有序数组中，并保持数组有序
+void insertStudent(Student students[], int *n, Student new_student) {
+    students[*n] = new_student;
+    (*n)++;
+    // 从后往前比较并调整顺序
+    for (int i = *n - 1; i > 0; i--) {
+        if (students[i].class_num < students[i - 1].class_num) {
+            swap(&students[i], &students[i - 1]);
+        } else if (students[i].class_num == students[i - 1].class_num) {
+            double cur_total = getTotalScore(&students[i]);
+            double prev_total = getTotalScore(&students[i - 1]);
+            if (cur_total > prev_total) {
+                swap(&students[i], &students[i - 1]);
+            } else {
+                break;
+            }
+        } else {
+            break;
+        }
+    }
+}
+
+// 打印学生数组信息
+void printStudents(Student students[], int n) {
+    for (int i = 0; i < n; i++) {
+        printf("%d %d %.1lf %.1lf %.1lf", students[i].id, students[i].class_num, students[i].score1, students[i].score2, students[i].score3);
+        if (i == n - 1 && n > 3) {
+            printf(" inserted\n");
+        } else {
+            printf("\n");
+        }
+    }
+}
+
+int main() {
+    Student students[100];  // 假设最多存储100个学生信息，可根据实际情况调整大小
+    int num_students = 3;   // 当前已有3个学生信息
+
+    // 静态初始化已有三个学生信息（按题目给定示例）
+    Student s1 = {10001, 11, 99.5, 88.5, 89.5};
+    Student s2 = {10002, 12, 77.9, 56.5, 87.5};
+    Student s3 = {10003, 11, 92.5, 99.0, 60.5};
+    students[0] = s1;
+    students[1] = s2;
+    students[2] = s3;
+
+    // 输入新学生信息
+    Student new_student;
+    scanf("%d %d %lf %lf %lf", &new_student.id, &new_student.class_num, &new_student.score1, &new_student.score2, &new_student.score3);
+
+    // 检查学号是否已存在
+    int exist = 0;
+    for (int i = 0; i < num_students; i++) {
+        if (students[i].id == new_student.id) {
+            exist = 1;
+            break;
+        }
+    }
+    if (exist) {
+        printf("该学号已存在:\n");
+        for (int i = 0; i < num_students; i++) {
+            if (students[i].id == new_student.id) {
+                printf("%d %d %.1lf %.1lf %.1lf\n", students[i].id, students[i].class_num, students[i].score1, students[i].score2, students[i].score3);
+            }
+        }
+        return 0;
+    }
+
+    // 插入新学生信息
+    insertStudent(students, &num_students, new_student);
+
+    // 输出所有学生信息
+    printStudents(students, num_students);
+
+    return 0;
+}