用C语言写一个课程信息管理系统

这里提供一个简单的课程信息管理系统的C语言代码示例，仅供参考：

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

#define MAX_COURSES 100

typedef struct course {
    char id[10];
    char name[50];
    char instructor[20];
    int credit;
} Course;

Course courses[MAX_COURSES];
int num_courses = 0;

void add_course() {
    if(num_courses >= MAX_COURSES) {
        printf("Too many courses. Cannot add more.\n");
        return;
    }

    Course new_course;
    printf("Enter course ID: ");
    scanf("%s", new_course.id);

    for(int i = 0; i < num_courses; i++) {
        if(strcmp(courses[i].id, new_course.id) == 0) {
            printf("Course with the same ID already exists.\n");
            return;
        }
    }

    printf("Enter course name: ");
    scanf("%s", new_course.name);

    printf("Enter instructor name: ");
    scanf("%s", new_course.instructor);

    printf("Enter credit: ");
    scanf("%d", &new_course.credit);

    courses[num_courses++] = new_course;
    printf("Course added successfully.\n");
}

void delete_course() {
    char id[10];
    printf("Enter course ID to delete: ");
    scanf("%s", id);

    for(int i = 0; i < num_courses; i++) {
        if(strcmp(courses[i].id, id) == 0) {
            for(int j = i; j < num_courses - 1; j++) {
                courses[j] = courses[j+1];
            }
            num_courses--;
            printf("Course deleted successfully.\n");
            return;
        }
    }

    printf("Course not found.\n");
}

void list_courses() {
    printf("ID\tName\tInstructor\tCredit\n");
    for(int i = 0; i < num_courses; i++) {
        printf("%s\t%s\t%s\t%d\n", courses[i].id, courses[i].name, courses[i].instructor, courses[i].credit);
    }
}

int main() {
    int choice;
    do {
        printf("\n1. Add course\n");
        printf("2. Delete course\n");
        printf("3. List courses\n");
        printf("4. Exit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);

        switch(choice) {
            case 1:
                add_course();
                break;
            case 2:
                delete_course();
                break;
            case 3:
                list_courses();
                break;
            case 4:
                printf("Exiting...\n");
                break;
            default:
                printf("Invalid choice. Try again.\n");
        }
    } while (choice != 4);

    return 0;
}

该代码实现了一个简单的课程信息管理系统，其中包括添加课程、删除课程和列出所有课程的功能。每门课程都包括ID、名称、教师和学分等信息。可以通过菜单进行选择功能。当添加课程时，会检查是否达到上限，并且不允许添加相同ID的课程。当删除课程时，会检查是否存在该课程。当列出所有课程时，会按照ID、名称、教师和学分的顺序显示所有课程。