主要内容：该系统实现对学生成绩的批量录入、修改、查询、浏览等功能。具体要求如下： 学生信息包括：学号、姓名、入学年月、4门课的成绩等8个成员，试设计学生成绩管理系统，使之能提供以下功能： 1、信息录入：录入每一位学生信息（包括学号、姓名、入学年月和4门课的成绩）； 2、信息浏览：输出系统内所有学生的信息； 3、成绩修改：输入学号，修改该生某一门课的成绩； 4、分类查询：按学号或姓名查找学生，输出学生的成绩单； 5、统计学生总成绩：计算每个学生的总分及平均分，并根据学生的平均成绩进行排序；6、统计每门课程的成绩：计算每一门课程学生的及格率、优秀率等。 的c语言代码

以下是一个简单的学生成绩管理系统的C语言代码实现： ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_STUDENTS 100 #define MAX_NAME_LEN 20 typedef struct { char id[10]; char name[MAX_NAME_LEN]; char start_date[10]; int scores[4]; int total_score; float ave_score; } Student; typedef struct { Student students[MAX_STUDENTS]; int count; } StudentManager; void init(StudentManager *manager) { manager->count = 0; } void add(StudentManager *manager, Student student) { manager->students[manager->count++] = student; } void print_header() { printf("%5s %-10s %-10s %4s %4s %4s %4s %6s %6s\n", "No.", "ID", "Name", "Course1", "Course2", "Course3", "Course4", "Total", "Average"); } void print_student(Student student, int index) { printf("%5d %-10s %-10s %4d %4d %4d %4d %6d %6.2f\n", index, student.id, student.name, student.scores[0], student.scores[1], student.scores[2], student.scores[3], student.total_score, student.ave_score); } void print(StudentManager manager) { print_header(); for (int i = 0; i < manager.count; i++) { print_student(manager.students[i], i+1); } } int find(StudentManager manager, char *key) { for (int i = 0; i < manager.count; i++) { if (strcmp(manager.students[i].id, key) == 0 || strcmp(manager.students[i].name, key) == 0) { return i; } } return -1; } void update(StudentManager *manager, char *id, int course, int score) { int index = find(*manager, id); if (index == -1) { printf("Student not found.\n"); } else { manager->students[index].scores[course-1] = score; int total_score = 0; for (int i = 0; i < 4; i++) { total_score += manager->students[index].scores[i]; } manager->students[index].total_score = total_score; manager->students[index].ave_score = total_score / 4.0; printf("Score updated.\n"); } } void sort(StudentManager *manager) { for (int i = 0; i < manager->count-1; i++) { for (int j = 0; j < manager->count-1-i; j++) { if (manager->students[j].ave_score < manager->students[j+1].ave_score) { Student temp = manager->students[j]; manager->students[j] = manager->students[j+1]; manager->students[j+1] = temp; } } } } void print_course_stats(StudentManager manager, int course) { int pass_count = 0, excellent_count = 0; for (int i = 0; i < manager.count; i++) { if (manager.students[i].scores[course-1] >= 60) { pass_count++; } if (manager.students[i].scores[course-1] >= 90) { excellent_count++; } } printf("Course %d statistics: pass rate=%.2f%%, excellent rate=%.2f%%\n", course, pass_count*100.0/manager.count, excellent_count*100.0/manager.count); } int main() { StudentManager manager; init(&manager); while (1) { printf("\nStudent Score Management System\n"); printf("1. Add Student\n"); printf("2. View Students\n"); printf("3. Update Score\n"); printf("4. Find Student\n"); printf("5. Sort Students\n"); printf("6. Course Statistics\n"); printf("0. Exit\n"); printf("Enter your choice: "); int choice; scanf("%d", &choice); switch (choice) { case 0: printf("Goodbye!\n"); exit(0); case 1: printf("Enter student ID: "); char id[10]; scanf("%s", id); printf("Enter student name: "); char name[MAX_NAME_LEN]; scanf("%s", name); printf("Enter start date (YYYY-MM-DD): "); char start_date[10]; scanf("%s", start_date); printf("Enter scores for 4 courses: "); int scores[4]; for (int i = 0; i < 4; i++) { scanf("%d", &scores[i]); } Student student = {0}; strcpy(student.id, id); strcpy(student.name, name); strcpy(student.start_date, start_date); for (int i = 0; i < 4; i++) { student.scores[i] = scores[i]; student.total_score += scores[i]; } student.ave_score = student.total_score / 4.0; add(&manager, student); printf("Student added.\n"); break; case 2: print(manager); break; case 3: printf("Enter student ID: "); scanf("%s", id); printf("Enter course number (1-4): "); int course; scanf("%d", &course); printf("Enter new score: "); int score; scanf("%d", &score); update(&manager, id, course, score); break; case 4: printf("Enter student ID or name: "); char key[20]; scanf("%s", key); int index = find(manager, key); if (index == -1) { printf("Student not found.\n"); } else { print_header(); print_student(manager.students[index], 1); } break; case 5: sort(&manager); printf("Students sorted by average score.\n"); print(manager); break; case 6: printf("Enter course number (1-4): "); scanf("%d", &course); print_course_stats(manager, course); break; default: printf("Invalid choice.\n"); break; } } return 0; } ``` 以上代码实现了一个简单的学生成绩管理系统，包括信息录入、信息浏览、成绩修改、分类查询、统计学生总成绩和每门课程的成绩等功能。其中采用了结构体存储学生信息，采用函数实现各种操作，以及采用排序算法对学生进行排序等。