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dazuoye.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// 定义学生结构体
+typedef struct Student {
+    char id[20];
+    char clas[20];
+    char name[20];
+    double score1;
+    double score2;
+    double score3;
+    double score;
+    struct Student* next;
+} Student;
+
+// 全局变量，指向学生链表的头结点和尾结点
+Student* head = NULL;
+Student* tail = NULL;
+
+// 函数声明
+void showMenu();
+void inputStudent();
+void deleteStudent();
+void selectStudent();
+void orderStudent();
+void outputStudent();
+void quit();
+
+// 主函数
+int main() {
+    showMenu();
+    return 0;
+}
+
+// 显示菜单
+void showMenu() {
+    printf("1. 输入学生信息\n");
+    printf("2. 删除学生信息\n");
+    printf("3. 查询学生信息\n");
+    printf("4. 排序学生信息\n");
+    printf("5. 输出学生信息\n");
+    printf("6. 退出\n");
+    printf("请选择操作：");
+
+    int option;
+    scanf("%d", &option);
+
+    switch (option) {
+        case 1:
+            inputStudent();
+            break;
+        case 2:
+            deleteStudent();
+            break;
+        case 3:
+            selectStudent();
+            break;
+        case 4:
+            orderStudent();
+            break;
+        case 5:
+            outputStudent();
+            break;
+        case 6:
+            quit();
+            break;
+        default:
+            printf("无效的选项，请重新选择。\n");
+            showMenu();
+            break;
+    }
+}
+
+// 输入学生信息
+void inputStudent() {
+    printf("请输入学生信息（学号 班级 姓名 成绩1 成绩2 成绩3）：\n");
+
+    Student* newStudent = (Student*)malloc(sizeof(Student));
+    scanf("%s %s %s %lf %lf %lf", newStudent->id, newStudent->clas, newStudent->name,
+          &newStudent->score1, &newStudent->score2, &newStudent->score3);
+    newStudent->score = newStudent->score1 + newStudent->score2 + newStudent->score3;
+    newStudent->next = NULL;
+
+    if (head == NULL) {
+        head = newStudent;
+        tail = newStudent;
+    } else {
+        tail->next = newStudent;
+        tail = newStudent;
+    }
+
+    printf("学生信息录入成功。\n");
+    showMenu();
+}
+
+// 删除学生信息
+void deleteStudent() {
+    if (head == NULL) {
+        printf("没有学生信息可供删除。\n");
+        showMenu();
+        return;
+    }
+
+    printf("请输入要删除的学生的学号或姓名：\n");
+    char search[20];
+    scanf("%s", search);
+
+    Student* current = head;
+    Student* previous = NULL;
+    int count = 0;
+
+    while (current != NULL) {
+        if (strcmp(current->id, search) == 0 || strcmp(current->name, search) == 0) {
+            if (previous == NULL) {
+                head = current->next;
+            } else {
+                previous->next = current->next;
+            }
+
+            free(current);
+            count++;
+        } else {
+            previous = current;
+        }
+
+        current = current->next;
+    }
+
+    if (count == 0) {
+        printf("未找到匹配的学生信息。\n");
+    } else {
+        printf("成功删除 %d 条学生信息。\n", count);
+    }
+
+    showMenu();
+}
+
+// 查询学生信息
+void selectStudent() {
+    if (head == NULL) {
+        printf("没有学生信息可供查询。\n");
+        showMenu();
+        return;
+    }
+
+    printf("请输入要查询的学生的学号或班级：\n");
+    char search[20];
+    scanf("%s", search);
+
+    Student* current = head;
+    int count = 0;
+
+    while (current != NULL) {
+        if (strcmp(current->id, search) == 0 || strcmp(current->clas, search) == 0) {
+            printf("学号：%s\n", current->id);
+            printf("班级：%s\n", current->clas);
+            printf("姓名：%s\n", current->name);
+            printf("成绩1：%lf\n", current->score1);
+            printf("成绩2：%lf\n", current->score2);
+            printf("成绩3：%lf\n", current->score3);
+            printf("总成绩：%lf\n", current->score);
+            printf("\n");
+            count++;
+        }
+
+        current = current->next;
+    }
+
+    if (count == 0) {
+        printf("未找到匹配的学生信息。\n");
+    }
+
+    showMenu();
+}
+
+// 排序学生信息
+void orderStudent() {
+    if (head == NULL) {
+        printf("没有学生信息可供排序。\n");
+        showMenu();
+        return;
+    }
+
+    int swapped;
+    Student* current;
+    Student* previous = NULL;
+
+    do {
+        swapped = 0;
+        current = head;
+
+        while (current->next != NULL) {
+            if (strcmp(current->clas, current->next->clas) > 0 ||
+                (strcmp(current->clas, current->next->clas) == 0 &&
+                 current->score < current->next->score)) {
+                if (previous == NULL) {
+                    head = current->next;
+                } else {
+                    previous->next = current->next;
+                }
+
+                Student* temp = current->next->next;
+                current->next->next = current;
+                current->next = temp;
+
+                swapped = 1;
+            }
+
+            previous = current;
+            current = current->next;
+        }
+    } while (swapped);
+
+    printf("学生信息排序成功。\n");
+    showMenu();
+}
+
+// 输出学生信息
+void outputStudent() {
+    if (head == NULL) {
+        printf("没有学生信息可供输出。\n");
+        showMenu();
+        return;
+    }
+
+    Student* current = head;
+
+    while (current != NULL) {
+        printf("学号：%s\n", current->id);
+        printf("班级：%s\n", current->clas);
+        printf("姓名：%s\n", current->name);
+        printf("成绩1：%lf\n", current->score1);
+        printf("成绩2：%lf\n", current->score2);
+        printf("成绩3：%lf\n", current->score3);
+        printf("总成绩：%lf\n", current->score);
+        printf("\n");
+
+        current = current->next;
+    }
+
+    showMenu();
+}
+
+// 退出程序
+void quit() {
+    printf("感谢使用学生成绩管理系统，再见！\n");
+}