用c语言链表设计一个选课系统

好的，以下是用 C 语言链表设计一个选课系统的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX_NAME_LEN 20

typedef struct course {
    char name[MAX_NAME_LEN];
    int id;
    int capacity;
    int enrolled;
    struct course *next;
} Course;

Course *head = NULL;

void add_course(char *name, int id, int capacity) {
    Course *new_course = (Course *)malloc(sizeof(Course));
    strncpy(new_course->name, name, MAX_NAME_LEN);
    new_course->id = id;
    new_course->capacity = capacity;
    new_course->enrolled = 0;
    new_course->next = NULL;

    if (head == NULL) {
        head = new_course;
    } else {
        Course *cur = head;
        while (cur->next != NULL) {
            cur = cur->next;
        }
        cur->next = new_course;
    }
}

void enroll(int id) {
    Course *cur = head;
    while (cur != NULL) {
        if (cur->id == id) {
            if (cur->enrolled < cur->capacity) {
                cur->enrolled++;
                printf("Enrolled in %s\n", cur->name);
            } else {
                printf("Course %s is full\n", cur->name);
            }
            return;
        }
        cur = cur->next;
    }
    printf("Course not found\n");
}

void print_courses() {
    Course *cur = head;
    while (cur != NULL) {
        printf("%d: %s (%d/%d)\n", cur->id, cur->name, cur->enrolled, cur->capacity);
        cur = cur->next;
    }
}

int main() {
    add_course("Math", 1, 30);
    add_course("English", 2, 20);
    add_course("History", 3, 25);

    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);
    enroll(1);

    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);
    enroll(2);

    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);
    enroll(3);

    print_courses();

    return 0;
}

这个选课系统使用链表来存储课程信息，每个课程包括名称、编号、容量和已选人数等信息。可以通过 `add_course` 函数添加课程，通过 `enroll` 函数选课，通过 `print_courses` 函数打印所有课程的信息。