diff --git a/简易成绩管理系统完整代码.cpp b/简易成绩管理系统完整代码.cpp
new file mode 100644
index 0000000..ea7424e
--- /dev/null
+++ b/简易成绩管理系统完整代码.cpp
@@ -0,0 +1,477 @@
+#include <stdio.h>
+#include <stdlib.h>  // ����qsort���������ͷ�ļ�
+#include <string.h>
+
+#define MAX_STUDENTS 100
+#define MAX_SUBJECTS 20
+#define NAME_LENGTH 50
+#define FILE_NAME "students.dat"
+#define SUBJECT_COUNT 8
+
+typedef struct {
+    char subjectName[NAME_LENGTH];
+    float credit;
+} Subject;
+
+typedef struct {
+    char name[NAME_LENGTH];
+    int studentID;
+    float grades[MAX_SUBJECTS];
+    int subjectCount;
+} Student;
+
+typedef struct {
+    char name[NAME_LENGTH];
+    int studentID;
+    float gpa;
+    int rank;
+} StudentGPA;
+
+Subject subjects[MAX_SUBJECTS] = {
+    {"�ߵ���ѧ", 4},
+    {"��ѧӢ��", 2},
+    {"���Դ���", 3},
+    {"���ݽṹ", 3},
+    {"����˼�������ԭ��", 3},
+    {"�й����ִ�ʷ��Ҫ", 3},
+    {"����������", 0.5},
+    {"����", 1}
+};
+int subjectCount = SUBJECT_COUNT;
+
+int findStudentByName(const Student students[], int studentCount, const char *name) {
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i].name, name) == 0) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+int findSubjectByName(const char *name) {
+    for (int i = 0; i < subjectCount; i++) {
+        if (strcmp(subjects[i].subjectName, name) == 0) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+int checkReturn(char *input) {
+    if (strcmp(input, "����") == 0) {
+        return 1;
+    }
+    return 0;
+}
+
+void addStudent(Student students[], int *studentCount) {
+    if (*studentCount >= MAX_STUDENTS) {
+        printf("�޷����Ӹ���ѧ�����Ѵﵽ�������\n");
+        return;
+    }
+
+    char name[NAME_LENGTH];
+    int studentID;
+    printf("����ѧ������ : ");
+    scanf("%s", name);
+    if (checkReturn(name)) return;
+
+    int existingIndex = findStudentByName(students, *studentCount, name);
+    if (existingIndex != -1) {
+        printf("ѧ�������ظ���ѡ�����:\n");
+        printf("1. ������������\n");
+        printf("2. ����\n");
+        int choice;
+        scanf("%d", &choice);
+        if (choice == 2) {
+            return;
+        } else if (choice == 1) {
+            printf("����ѧ��ѧ��: ");
+            scanf("%d", &studentID);
+
+            Student *student = &students[existingIndex];
+            strcpy(student->name, name);
+            student->studentID = studentID;
+
+            for (int i = 0; i < subjectCount; i++) {
+                printf("����%s�ijɼ�: ", subjects[i].subjectName);
+                char input[10];
+                scanf("%s", input);
+                if (checkReturn(input)) return;
+                student->grades[i] = atof(input);
+            }
+            student->subjectCount = subjectCount;
+            printf("ѧ�������Ѹ���\n");
+            return;
+        }
+    }
+
+    printf("����ѧ��ѧ��: ");
+    scanf("%d", &studentID);
+
+    Student newStudent;
+    strcpy(newStudent.name, name);
+    newStudent.studentID = studentID;
+
+    for (int i = 0; i < subjectCount; i++) {
+        printf("����%s�ijɼ�: ", subjects[i].subjectName);
+        char input[10];
+        scanf("%s", input);
+        if (checkReturn(input)) return;
+        newStudent.grades[i] = atof(input);
+    }
+    newStudent.subjectCount = subjectCount;
+
+    students[*studentCount] = newStudent;
+    (*studentCount)++;
+}
+
+void displayStudent(const Student *student) {
+    printf("ѧ������: %s\n", student->name);
+    printf("ѧ��ѧ��: %d\n", student->studentID);
+
+    for (int i = 0; i < student->subjectCount; i++) {
+        printf("  ѧ������: %s\n", subjects[i].subjectName);
+        printf("  ѧ�Ƴɼ�: %.2f\n", student->grades[i]);
+        printf("  ѧ��ѧ��: %.1f\n", subjects[i].credit);
+    }
+}
+
+void displayStudents(const Student students[], int studentCount) {
+    for (int i = 0; i < studentCount; i++) {
+        displayStudent(&students[i]);
+    }
+}
+
+int findStudentByID(const Student students[], int studentCount, int studentID) {
+    for (int i = 0; i < studentCount; i++) {
+        if (students[i].studentID == studentID) {
+            return i;
+        }
+    }
+    return -1;
+}
+
+void displayStudentByID(const Student students[], int studentCount) {
+    char input[10];
+    printf("����ѧ��ѧ��: ");
+    scanf("%s", input);
+    if (checkReturn(input)) return;
+    int studentID = atoi(input);
+
+    int index = findStudentByID(students, studentCount, studentID);
+    if (index != -1) {
+        displayStudent(&students[index]);
+    } else {
+        printf("δ�ҵ�ѧ��Ϊ %d ��ѧ��\n", studentID);
+    }
+}
+
+void deleteStudent(Student students[], int *studentCount) {
+    char input[10];
+    printf("����Ҫɾ����ѧ��ѧ��: ");
+    scanf("%s", input);
+    if (checkReturn(input)) return;
+    int studentID = atoi(input);
+
+    int index = findStudentByID(students, *studentCount, studentID);
+    if (index != -1) {
+        for (int i = index; i < *studentCount - 1; i++) {
+            students[i] = students[i + 1];
+        }
+        (*studentCount)--;
+        printf("ѧ����ɾ��\n");
+    } else {
+        printf("δ�ҵ�ѧ��Ϊ %d ��ѧ��\n", studentID);
+    }
+}
+
+void saveStudentsToFile(const Student students[], int studentCount) {
+    FILE *file = fopen(FILE_NAME, "wb");
+    if (file == NULL) {
+        printf("�޷����ļ�����д��\n");
+        return;
+    }
+    fwrite(&studentCount, sizeof(int), 1, file);
+    fwrite(students, sizeof(Student), studentCount, file);
+    fclose(file);
+}
+
+void loadStudentsFromFile(Student students[], int *studentCount) {
+    FILE *file = fopen(FILE_NAME, "rb");
+    if (file == NULL) {
+        printf("�޷����ļ����ж�ȡ\n");
+        return;
+    }
+    fread(studentCount, sizeof(int), 1, file);
+    fread(students, sizeof(Student), *studentCount, file);
+    fclose(file);
+}
+
+void addSubject() {
+    if (subjectCount >= MAX_SUBJECTS) {
+        printf("�޷����Ӹ���ѧ�ƣ��Ѵﵽ�������\n");
+        return;
+    }
+
+    char subjectName[NAME_LENGTH];
+    float credit;
+
+    printf("����ѧ������: ");
+    scanf("%s", subjectName);
+    if (checkReturn(subjectName)) return;
+
+    int existingIndex = findSubjectByName(subjectName);
+    if (existingIndex != -1) {
+        printf("ѧ�������ظ���ѡ�����:\n");
+        printf("1. ������������\n");
+        printf("2. ����\n");
+        int choice;
+        scanf("%d", &choice);
+        if (choice == 2) {
+            return;
+        } else if (choice == 1) {
+            printf("����ѧ��ѧ��: ");
+            char input[10];
+            scanf("%s", input);
+            if (checkReturn(input)) return;
+            credit = atof(input);
+            subjects[existingIndex].credit = credit;
+            printf("ѧ�������Ѹ���\n");
+            return;
+        }
+    }
+
+    printf("����ѧ��ѧ��: ");
+    char input[10];
+    scanf("%s", input);
+    if (checkReturn(input)) return;
+    credit = atof(input);
+
+    Subject newSubject;
+    strcpy(newSubject.subjectName, subjectName);
+    newSubject.credit = credit;
+
+    subjects[subjectCount] = newSubject;
+    subjectCount++;
+    printf("ѧ��������\n");
+}
+
+void deleteSubject() {
+    char subjectName[NAME_LENGTH];
+    printf("����Ҫɾ����ѧ������: ");
+    scanf("%s", subjectName);
+    if (checkReturn(subjectName)) return;
+
+    int index = findSubjectByName(subjectName);
+    if (index != -1) {
+        for (int i = index; i < subjectCount - 1; i++) {
+            subjects[i] = subjects[i + 1];
+        }
+        subjectCount--;
+        printf("ѧ����ɾ��\n");
+    } else {
+        printf("δ�ҵ�����Ϊ %s ��ѧ��\n", subjectName);
+    }
+}
+
+float calculateGPA(const Student *student) {
+    float totalGradePoints = 0.0;
+    float totalCredits = 0.0;
+
+    for (int i = 0; i < student->subjectCount; i++) {
+        float grade = student->grades[i] < 60 ? 0 : student->grades[i];
+        totalGradePoints += grade * subjects[i].credit;
+        totalCredits += subjects[i].credit;
+    }
+
+    float gpa = (totalGradePoints / totalCredits) / 10 - 5;
+    return gpa;
+}
+
+void calculateGPAs(const Student students[], int studentCount, StudentGPA studentGPAs[]) {
+    for (int i = 0; i < studentCount; i++) {
+        studentGPAs[i].gpa = calculateGPA(&students[i]);
+        strcpy(studentGPAs[i].name, students[i].name);
+        studentGPAs[i].studentID = students[i].studentID;
+    }
+}
+
+int compareGPA(const void *a, const void *b) {
+    float gpaA = ((StudentGPA *)a)->gpa;
+    float gpaB = ((StudentGPA *)b)->gpa;
+
+    if (gpaA < gpaB) return 1;
+    if (gpaA > gpaB) return -1;
+    return 0;
+}
+
+void displayGPAByID(const Student students[], int studentCount) {
+    char input[10];
+    printf("����ѧ��ѧ��: ");
+    scanf("%s", input);
+    if (checkReturn(input)) return;
+    int studentID = atoi(input);
+
+    int index = findStudentByID(students, studentCount, studentID);
+    if (index != -1) {
+        StudentGPA studentGPA;
+        studentGPA.gpa = calculateGPA(&students[index]);
+        strcpy(studentGPA.name, students[index].name);
+        studentGPA.studentID = students[index].studentID;
+        
+        StudentGPA studentGPAs[MAX_STUDENTS];
+        calculateGPAs(students, studentCount, studentGPAs);
+        qsort(studentGPAs, studentCount, sizeof(StudentGPA), compareGPA);
+
+        for (int i = 0; i < studentCount; i++) {
+            if (studentGPAs[i].studentID == studentID) {
+                studentGPA.rank = i + 1;
+                break;
+            }
+        }
+
+        printf("ѧ������: %s\n", studentGPA.name);
+        printf("ѧ��ѧ��: %d\n", studentGPA.studentID);
+        printf("ƽ��ѧ�ּ���(GPA): %.2f\n", studentGPA.gpa);
+        printf("����: %d\n", studentGPA.rank);
+    } else {
+        printf("δ�ҵ�ѧ��Ϊ %d ��ѧ��\n", studentID);
+    }
+}
+
+void displayAllGPAs(const Student students[], int studentCount) {
+    StudentGPA studentGPAs[MAX_STUDENTS];
+    calculateGPAs(students, studentCount, studentGPAs);
+    qsort(studentGPAs, studentCount, sizeof(StudentGPA), compareGPA);
+
+    for (int i = 0; i < studentCount; i++) {
+        studentGPAs[i].rank = i + 1;
+        printf("ѧ������: %s\n", studentGPAs[i].name);
+        printf("ѧ��ѧ��: %d\n", studentGPAs[i].studentID);
+        printf("ƽ��ѧ�ּ���(GPA): %.2f\n", studentGPAs[i].gpa);
+        printf("����: %d\n", studentGPAs[i].rank);
+        printf("\n");
+    }
+}
+
+void GPAQuery(const Student students[], int studentCount) {
+    char input[10];
+    printf("ѡ�����:\n");
+    printf("1. ��ѯ����ѧ����ƽ��ѧ�ּ��������\n");
+    printf("2. ��ѯ����ѧ����ƽ��ѧ�ּ���\n");
+    scanf("%s", input);
+    if (checkReturn(input)) return;
+    int choice = atoi(input);
+
+    switch (choice) {
+        case 1:
+            displayGPAByID(students, studentCount);
+            break;
+        case 2:
+            displayAllGPAs(students, studentCount);
+            break;
+        default:
+            printf("��Ч��ѡ�������ѡ��\n");
+    }
+}
+
+void studentManagement(Student students[], int *studentCount) {
+    char input[10];
+    while (1) {
+        printf("\nѧ������\n");
+        printf("1. ����ѧ��\n");
+        printf("2. ��ʾ����ѧ��\n");
+        printf("3. ��ʾ����ѧ��\n");
+        printf("4. ɾ��ѧ��\n");
+        printf("5. �������˵�\n");
+        scanf("%s", input);
+        if (checkReturn(input)) return;
+        int choice = atoi(input);
+
+        switch (choice) {
+            case 1:
+                addStudent(students, studentCount);
+                break;
+            case 2:
+                displayStudents(students, *studentCount);
+                break;
+            case 3:
+                displayStudentByID(students, *studentCount);
+                break;
+            case 4:
+                deleteStudent(students, studentCount);
+                break;
+            case 5:
+                return;
+            default:
+                printf("��Ч��ѡ�������ѡ��\n");
+        }
+    }
+}
+
+void subjectManagement() {
+    char input[10];
+    while (1) {
+        printf("\nѧ�ƹ���\n");
+        printf("1. ����ѧ��\n");
+        printf("2. ɾ��ѧ��\n");
+        printf("3. �������˵�\n");
+        scanf("%s", input);
+        if (checkReturn(input)) return;
+        int choice = atoi(input);
+
+        switch (choice) {
+            case 1:
+                addSubject();
+                break;
+            case 2:
+                deleteSubject();
+                break;
+            case 3:
+                return;
+            default:
+                printf("��Ч��ѡ�������ѡ��\n");
+        }
+    }
+}
+
+int main() {
+    Student students[MAX_STUDENTS];
+    int studentCount = 0;
+    char input[10];
+
+    loadStudentsFromFile(students, &studentCount);
+
+    while (1) {
+        printf("\nѧ���ɼ�����ϵͳ\n");
+        printf("��ǰѧ������: %d\n", studentCount);
+        printf("1. ѧ������\n");
+        printf("2. ѧ�ƹ���\n");
+        printf("3. GPA ��ѯ������\n");
+        printf("4. �˳�\n");
+        scanf("%s", input);
+        if (checkReturn(input)) continue;
+        int choice = atoi(input);
+
+        switch (choice) {
+            case 1:
+                studentManagement(students, &studentCount);
+                break;
+            case 2:
+                subjectManagement();
+                break;
+            case 3:
+                GPAQuery(students, studentCount);
+                break;
+            case 4:
+                saveStudentsToFile(students, studentCount);
+                return 0;
+            default:
+                printf("��Ч��ѡ�������ѡ��\n");
+        }
+    }
+
+    return 0;
+}
+