编写一个c语言学生管理系统

好的，我可以为您提供关于学生管理系统的C语言代码。您需要考虑的一些基本功能包括：添加新学生，删除学生，显示学生信息，修改学生信息等。以下是一个简单的示例代码：

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

struct student{
    char name[20];
    int id;
    float score;
};

struct node{
    struct student data;
    struct node *next;
};

void menu();
void add_node(struct node **head);
void delete_node(struct node **head);
void display(struct node *head);
void modify(struct node *head);

int main(){
    struct node *head = NULL;
    int choice;

    do{
        menu();
        scanf("%d", &choice);

        switch(choice){
            case 1:
                add_node(&head);
                break;
            case 2:
                delete_node(&head);
                break;
            case 3:
                display(head);
                break;
            case 4:
                modify(head);
                break;
            case 5:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice! Please try again.\n");
                break;
        }
    }while(choice != 5);

    return 0;
}

void menu(){
    printf("Welcome to the student management system!\n");
    printf("1. Add student\n");
    printf("2. Delete student\n");
    printf("3. Display all students\n");
    printf("4. Modify student information\n");
    printf("5. Exit\n");
    printf("Please enter your choice: ");
}

void add_node(struct node **head){
    struct node *temp = (struct node*)malloc(sizeof(struct node));
    printf("Please enter the student's name: ");
    scanf("%s", temp->data.name);
    printf("Please enter the student's ID: ");
    scanf("%d", &temp->data.id);
    printf("Please enter the student's score: ");
    scanf("%f", &temp->data.score);
    temp->next = *head;
    *head = temp;
}

void delete_node(struct node **head){
    int id;
    struct node *temp = *head;
    struct node *prev = NULL;

    printf("Please enter the student's ID to delete: ");
    scanf("%d", &id);

    while(temp != NULL && temp->data.id != id){
        prev = temp;
        temp = temp->next;
    }

    if(temp == NULL){
        printf("Student not found!\n");
    }
    else if(prev == NULL){
        *head = temp->next;
        free(temp);
    }
    else{
        prev->next = temp->next;
        free(temp);
    }
}

void display(struct node *head){
    struct node *temp = head;
    printf("Name\tID\tScore\n");
    while(temp != NULL){
        printf("%s\t%d\t%.2f\n", temp->data.name, temp->data.id, temp->data.score);
        temp = temp->next;
    }
}

void modify(struct node *head){
    int id;
    struct node *temp = head;

    printf("Please enter the student's ID to modify: ");
    scanf("%d", &id);

    while(temp != NULL && temp->data.id != id){
        temp = temp->next;
    }

    if(temp == NULL){
        printf("Student not found!\n");
    }
    else{
        printf("Please enter the student's new name: ");
        scanf("%s", temp->data.name);
        printf("Please enter the student's new score: ");
        scanf("%f", &temp->data.score);
        printf("Student information modified successfully!\n");
    }
}

这是一个简单的学生管理系统，可以满足基本的添加、删除、修改和显示学生信息的需求。请根据您的具体需求进行修改和完善。