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作业.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_STUDENTS 100
+
+typedef struct {
+    int id;
+    char name[50];
+    int score;
+} Student;
+
+int displayMenu() {
+    printf("\n学生成绩管理系统\n");
+    printf("1. 录入学生信息\n");
+    printf("2. 显示所有学生信息\n");
+    printf("3. 插入学生信息\n");
+    printf("4. 删除学生信息\n");
+    printf("5. 修改学生信息\n");
+    printf("6. 查询学生信息\n");
+    printf("7. 退出系统\n");
+    printf("请选择操作: ");
+    int choice;
+    scanf("%d", &choice);
+    return choice;
+}
+
+void addStudent(Student students[], int *count) {
+    if (*count >= MAX_STUDENTS) {
+        printf("学生信息已满，无法添加更多学生。\n");
+        return;
+    }
+    printf("请输入学生ID: ");
+    scanf("%d", &students[*count].id);
+    printf("请输入学生姓名: ");
+    scanf("%s", students[*count].name);
+    printf("请输入学生成绩: ");
+    scanf("%d", &students[*count].score);
+    (*count)++;
+    printf("学生信息录入成功。\n");
+}
+c
+
+void displayStudents(const Student students[], int count) {
+    if (count == 0) {
+        printf("没有学生信息。\n");
+        return;
+    }
+    printf("学生ID\t姓名\t成绩\n");
+    for (int i = 0; i < count; i++) {
+        printf("%d\t%s\t%d\n", students[i].id, students[i].name, students[i].score);
+    }
+}
+
+
+void insertStudent(Student students[], int *count) {
+    if (*count >= MAX_STUDENTS) {
+        printf("学生信息已满，无法添加更多学生。\n");
+        return;
+    }
+    Student newStudent;
+    printf("请输入学生ID: ");
+    scanf("%d", &newStudent.id);
+    printf("请输入学生姓名: ");
+    scanf("%s", newStudent.name);
+    printf("请输入学生成绩: ");
+    scanf("%d", &newStudent.score);
+
+    int index = *count;
+    while (index > 0 &&students[index - 1].score < newStudent.score) {
+        students[index] = students[index - 1];
+        index--;
+    }
+    students[index] = newStudent;
+    (*count)++;
+    printf("学生信息插入成功。\n");
+}
+
+
+void deleteStudent(Student students[], int *count) {
+    if (*count == 0) {
+        printf("没有学生信息。\n");
+        return;
+    }
+    int id;
+    printf("请输入要删除的学生ID: ");
+    scanf("%d", &id);
+
+    int index = -1;
+    for (int i = 0; i < *count; i++) {
+        if (students[i].id == id) {
+            index = i;
+            break;
+        }
+    }
+
+    if (index == -1) {
+        printf("未找到指定ID的学生。\n");
+        return;
+    }
+
+    for (int i = index; i < *count - 1; i++) {
+        students[i] = students[i + 1];
+    }
+    (*count)--;
+    printf("学生信息删除成功。\n");
+}
+
+void modifyStudent(Student students[], int count) {
+    if (count == 0) {
+        printf("没有学生信息。\n");
+        return;
+    }
+    int id;
+    printf("请输入要修改的学生ID: ");
+    scanf("%d", &id);
+
+    int index = -1;
+    for (int i = 0; i < count; i++) {
+        if (students[i].id == id) {
+            index = i;
+            break;
+        }
+    }
+
+    if (index == -1) {
+        printf("未找到指定ID的学生。\n");
+        return;
+    }
+
+    printf("请输入新的学生姓名: ");
+    scanf("%s", students[index].name);
+    printf("请输入新的学生成绩: ");
+    scanf("%d", &students[index].score);
+    printf("学生信息修改成功。\n");
+
+    // 重新排序
+    qsort(students, count, sizeof(Student), compareStudents);
+}
+
+int compareStudents(const void *a, const void *b) {
+    return ((Student *)b)->score - ((Student *)a)->score;
+}
+
+void queryStudent(const Student students[], int count) {
+    if (count == 0) {
+        printf("没有学生信息。\n");
+        return;
+    }
+    int id;
+    printf("请输入要查询的学生ID: ");
+    scanf("%d", &id);
+
+    int found = 0;
+    for (int i = 0; i < count; i++) {
+        if (students[i].id == id) {
+            printf("学生ID: %d, 姓名: %s, 成绩: %d\n", students[i].id, students[i].name, students[i].score);
+            found = 1;
+            break;
+        }
+    }
+
+    if (!found) {
+        printf("未找到指定ID的学生。\n");
+    }
+}
+
+int main() {
+    Student students[MAX_STUDENTS];
+    int count = 0;
+    int choice;
+
+    do {
+        choice = displayMenu();
+        switch (choice) {
+            case 1:
+                addStudent(students, &count);
+                break;
+            case 2:
+                displayStudents(students, count);
+                break;
+            case 3:
+                insertStudent(students, &count);
+                break;
+            case 4:
+                deleteStudent(students, &count);
+                break;
+            case 5:
+                modifyStudent(students, count);
+                break;
+            case 6:
+                queryStudent(students, count);
+                break;
+            case 7:
+                printf("退出系统。\n");
+                break;
+            default:
+                printf("无效的选择，请重新输入。\n");
+        }
+    } while (choice != 7);
+
+    return 0;
+}
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