C语言学生选课系统链表实现

以下是一个简单的 C 语言学生选课系统链表实现：

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

struct course {
    char name[20];
    int credit;
    struct course *next;
};

struct student {
    char name[20];
    struct course *courses;
    struct student *next;
};

struct student *head = NULL;

void add_student() {
    struct student *new_student = (struct student *) malloc(sizeof(struct student));
    printf("Enter student name: ");
    scanf("%s", new_student->name);
    new_student->courses = NULL;
    new_student->next = NULL;
    if (head == NULL) {
        head = new_student;
    } else {
        struct student *cur = head;
        while (cur->next != NULL) {
            cur = cur->next;
        }
        cur->next = new_student;
    }
}

void add_course() {
    printf("Enter student name: ");
    char name[20];
    scanf("%s", name);
    struct student *cur = head;
    while (cur != NULL) {
        if (strcmp(cur->name, name) == 0) {
            struct course *new_course = (struct course *) malloc(sizeof(struct course));
            printf("Enter course name: ");
            scanf("%s", new_course->name);
            printf("Enter course credit: ");
            scanf("%d", &new_course->credit);
            new_course->next = NULL;
            if (cur->courses == NULL) {
                cur->courses = new_course;
            } else {
                struct course *cur_course = cur->courses;
                while (cur_course->next != NULL) {
                    cur_course = cur_course->next;
                }
                cur_course->next = new_course;
            }
            return;
        }
        cur = cur->next;
    }
    printf("Student not found.\n");
}

void print_report() {
    struct student *cur = head;
    while (cur != NULL) {
        printf("Student name: %s\n", cur->name);
        struct course *cur_course = cur->courses;
        while (cur_course != NULL) {
            printf("Course name: %s, Course credit: %d\n", cur_course->name, cur_course->credit);
            cur_course = cur_course->next;
        }
        printf("------------------------------\n");
        cur = cur->next;
    }
}

int main() {
    int choice;
    do {
        printf("1. Add student\n");
        printf("2. Add course\n");
        printf("3. Print report\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                add_course();
                break;
            case 3:
                print_report();
                break;
            case 4:
                exit(0);
                break;
            default:
                printf("Invalid choice.\n");
        }
    } while (1);
    return 0;
}

这个程序使用两个结构体来实现学生选课系统。一个结构体用于表示课程，另一个结构体用于表示学生。每个学生都有一个指向他们所选课程的指针。这个程序使用链表来存储学生和课程信息。

在 `add_student` 函数中，新建一个学生节点并从用户输入中获取学生姓名。如果链表为空，则将新节点设置为链表头。否则，遍历链表并将新节点插入到链表末尾。

在 `add_course` 函数中，从用户输入中获取学生姓名。然后遍历链表以查找该学生。如果找到了该学生，则新建一个课程节点并从用户输入中获取课程名称和学分。如果该学生没有选过课，则将新节点设置为该学生的课程列表的头。否则，遍历学生的课程列表并将新节点插入到列表末尾。

在 `print_report` 函数中，遍历链表并打印每个学生的姓名和所选课程的名称和学分。