diff --git a/xjxtfff.cpp b/xjxtfff.cpp
new file mode 100644
index 0000000..62600bd
--- /dev/null
+++ b/xjxtfff.cpp
@@ -0,0 +1,190 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct Student {
+    char id[20];
+    char mclass[20];
+    char name[20];
+    float score1, score2, score3;
+    struct Student* next;
+} Student;
+
+Student* head = NULL; // 头节点指针
+
+void showMenu() {
+    printf("%30s1. input\n", " ");
+    printf("%30s2. delete\n", " ");
+    printf("%30s3. select\n", " ");
+    printf("%30s4. order\n", " ");
+    printf("%30s5. output\n", " ");
+    printf("%30s6. quit\n", " ");
+    printf("%30splease input your option\n", " ");
+}
+
+void insertStudent() {
+    Student* newStudent = (Student*)malloc(sizeof(Student));
+    printf("ID: ");
+    scanf("%s", newStudent->id);
+    printf("class: ");
+    scanf("%s", newStudent->mclass);
+    printf("name: ");
+    scanf("%s", newStudent->name);
+    printf("score1: ");
+    scanf("%f", &newStudent->score1);
+    printf("score2: ");
+    scanf("%f", &newStudent->score2);
+    printf("score3: ");
+    scanf("%f", &newStudent->score3);
+    newStudent->next = head;
+    head = newStudent;
+}
+
+void printStudent() {
+    Student* current = head;
+    while (current != NULL) {
+        printf("%s %s %s %.1f %.1f %.1f\n", current->id, current->mclass, current->name, current->score1, current->score2, current->score3);
+        current = current->next;
+    }
+}
+
+void deleteStudent() {
+    char idOrName[20];
+    scanf("%s", idOrName);
+    Student* current = head;
+    Student* prev = NULL;
+    while (current != NULL) {
+        if (strcmp(current->id, idOrName) == 0 || strcmp(current->name, idOrName) == 0) {
+            if (prev == NULL) {
+                head = current->next;
+            } else {
+                prev->next = current->next;
+            }
+            free(current);
+            break;
+        }
+        prev = current;
+        current = current->next;
+    }
+    printStudent();
+}
+
+
+
+void selectStudent() {
+    char idOrName[20];
+    scanf("%s", idOrName);
+    Student* current = head;
+    int found = 0;
+    while (current != NULL) {
+        if (strcmp(current->id, idOrName) == 0 || strcmp(current->name, idOrName) == 0) {
+            printf("%s %s %s %.1f %.1f %.1f\n", current->id, current->mclass, current->name, current->score1, current->score2, current->score3);
+            found = 1;
+        }
+        current = current->next;
+    }
+    if (found == 0) {
+        printf("There is no eligible student\n");
+    }
+}
+
+
+void orderStudent() 
+{
+    Student *ptr1, *ptr2;
+    Student tempStudent;
+    
+    if (head == NULL) {
+        return;
+    }
+    
+    for (ptr1 = head; ptr1->next != NULL; ptr1 = ptr1->next) {
+        for (ptr2 = ptr1->next; ptr2 != NULL; ptr2 = ptr2->next) {
+            if ((ptr1->mclass)>(ptr2->mclass)||((ptr1->mclass)==(ptr2->mclass)&&(ptr1->score1 + ptr1->score2 + ptr1->score3) < (ptr2->score1 + ptr2->score2 + ptr2->score3)))
+			 {
+                // 交换两个学生节点的数据
+                strcpy(tempStudent.id, ptr1->id);
+                strcpy(tempStudent.mclass, ptr1->mclass);
+                strcpy(tempStudent.name, ptr1->name);
+                tempStudent.score1 = ptr1->score1;
+                tempStudent.score2 = ptr1->score2;
+                tempStudent.score3 = ptr1->score3;
+
+                strcpy(ptr1->id, ptr2->id);
+                strcpy(ptr1->mclass, ptr2->mclass);
+                strcpy(ptr1->name, ptr2->name);
+                ptr1->score1 = ptr2->score1;
+                ptr1->score2 = ptr2->score2;
+                ptr1->score3 = ptr2->score3;
+
+                strcpy(ptr2->id, tempStudent.id);
+                strcpy(ptr2->mclass, tempStudent.mclass);
+                strcpy(ptr2->name, tempStudent.name);
+                ptr2->score1 = tempStudent.score1;
+                ptr2->score2 = tempStudent.score2;
+                ptr2->score3 = tempStudent.score3;
+            }
+        }
+    }
+    printStudent();
+}
+
+
+int main() {
+    int choice;
+    char a[4];
+    while (1) {
+        showMenu();
+        scanf("%d", &choice);
+        switch (choice) {
+            case 1:
+                insertStudent();
+                while (1) {
+                    printf("Continue?\n");
+                    scanf("%s", &a);
+                    if (strcmp(a, "yes") == 0) {
+                        insertStudent();
+                        continue;
+                    } else {
+                        break;
+                    }
+                }
+                break;
+            case 2:
+                deleteStudent();
+                while (1) {
+                    printf("Continue?\n");
+                    scanf("%s", &a);
+                    if (strcmp(a, "yes") == 0) {
+                        deleteStudent();
+                        continue;
+                    } else {
+                        break;
+                    }
+                }
+                break;
+            case 3:
+                selectStudent();
+                while (1) {
+                    printf("Continue?\n");
+                    scanf("%s", &a);
+                    if (strcmp(a, "yes") == 0) {
+                        selectStudent();
+                        continue;
+                    } else {
+                        break;
+                    }
+                }
+                break;
+            case 4:
+                orderStudent();
+                break;
+            case 5:
+                printStudent();
+                break;
+            case 6:
+                return 0;
+        }
+    }
+}
+