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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// 定义学生结构体，包含学号、班级、姓名以及三门课程成绩
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typedef struct Student {
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int id;
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int class_num;
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char name[20];
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double score1;
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double score2;
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double score3;
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} Student;
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// 交换两个学生结构体的函数
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void swap(Student *a, Student *b) {
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Student temp = *a;
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*a = *b;
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*b = temp;
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}
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// 计算学生的总成绩
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double totalScore(const Student *s) {
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return s->score1 + s->score2 + s->score3;
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}
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// 根据学号查找学生在数组中的索引位置，若没找到返回 -1
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int findStudentIndex(Student students[], int num_students, int target_id) {
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for (int i = 0; i < num_students; i++) {
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if (students[i].id == target_id) {
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return i;
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}
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}
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return -1;
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}
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// 修改指定学号的学生信息，并重新调整数组顺序以保持有序
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void modifyStudent(Student students[], int *num_students, Student new_student) {
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int index = findStudentIndex(students, *num_students, new_student.id);
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if (index!= -1) {
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students[index] = new_student;
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// 从修改位置开始，向前比较调整顺序（保证班级从小到大，同一班级内总成绩从大到小）
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for (int i = index; i > 0; i--) {
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if (students[i].class_num < students[i - 1].class_num) {
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swap(&students[i], &students[i - 1]);
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} else if (students[i].class_num == students[i - 1].class_num) {
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double cur_total = totalScore(&students[i]);
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double prev_total = totalScore(&students[i - 1]);
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if (cur_total > prev_total) {
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swap(&students[i], &students[i - 1]);
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} else {
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break;
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}
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} else {
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break;
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}
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}
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// 从修改位置开始，向后比较调整顺序
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for (int i = index; i < *num_students - 1; i++) {
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if (students[i].class_num > students[i + 1].class_num) {
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swap(&students[i], &students[i + 1]);
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} else if (students[i].class_num == students[i + 1].class_num) {
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double cur_total = totalScore(&students[i]);
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double next_total = totalScore(&students[i + 1]);
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if (cur_total < next_total) {
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swap(&students[i], &students[i + 1]);
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} else {
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break;
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}
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} else {
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break;
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}
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}
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}
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}
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// 按照要求格式打印学生数组信息，同一班级的学生除第一个外缩进显示，且标记修改的学生
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void printStudents(Student students[], int num_students) {
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int current_class = students[0].class_num;
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for (int i = 0; i < num_students; i++) {
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if (students[i].class_num == current_class) {
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if (i == 0) {
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printf("%d %d %s %.1lf %.1lf %.1lf", students[i].class_num, students[i].id, students[i].name,
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students[i].score1, students[i].score2, students[i].score3);
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} else {
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printf(" %d %s %.1lf %.1lf %.1lf", students[i].id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
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}
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if (i == num_students - 1 && findStudentIndex(students, num_students, students[i].id)!= -1) {
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printf(" modified\n");
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} else {
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printf("\n");
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}
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} else {
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current_class = students[i].class_num;
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printf("%d %d %s %.1lf %.1lf %.1lf\n", students[i].class_num, students[i].id, students[i].name,
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students[i].score1, students[i].score2, students[i].score3);
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}
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}
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}
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int main() {
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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
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int num_students = 3; // 初始已有3个学生信息
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// 静态初始化已有三个学生信息（按题目给定示例）
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Student s1 = {10001, 11, "Zhang", 99.5, 88.5, 89.5};
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Student s2 = {10002, 12, "Yang", 77.9, 56.5, 87.5};
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Student s3 = {10003, 11, "Liang", 92.5, 99.0, 60.5};
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students[0] = s1;
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students[1] = s2;
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students[2] = s3;
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Student new_student;
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printf("please input:\n");
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scanf("%d %d %s %lf %lf %lf", &new_student.id, &new_student.class_num, &new_student.name, &new_student.score1, &new_student.score2, &new_student.score3);
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// 查找要修改的学生是否存在
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int exist = findStudentIndex(students, num_students, new_student.id);
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if (exist == -1) {
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// 如果学生不存在，直接输出原有学生信息并结束程序
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printStudents(students, num_students);
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return 0;
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}
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// 如果学生存在，修改学生信息并输出更新后的信息
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modifyStudent(students, &num_students, new_student);
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printStudents(students, num_students);
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return 0;
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} |
