c数据结构的学生成绩管理系统代码

以下是一个基于C语言的学生成绩管理系统代码，其中使用了链表数据结构来存储学生信息和成绩：

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

// 定义学生结构体
typedef struct student {
    char name[20]; // 学生姓名
    int id; // 学生学号
    float score; // 学生成绩
    struct student *next; // 指向下一个学生的指针
} Student;

// 定义链表头指针
Student *head = NULL;

// 添加学生信息
void add_student() {
    Student *new_student = (Student*)malloc(sizeof(Student));
    printf("请输入学生姓名：");
    scanf("%s", new_student->name);
    printf("请输入学生学号：");
    scanf("%d", &new_student->id);
    printf("请输入学生成绩：");
    scanf("%f", &new_student->score);
    new_student->next = head;
    head = new_student;
    printf("添加成功！\n");
}

// 删除学生信息
void delete_student() {
    int id;
    printf("请输入要删除的学生学号：");
    scanf("%d", &id);
    Student *current = head;
    Student *previous = NULL;
    while (current != NULL) {
        if (current->id == id) {
            if (previous == NULL) {
                head = current->next;
            } else {
                previous->next = current->next;
            }
            free(current);
            printf("删除成功！\n");
            return;
        }
        previous = current;
        current = current->next;
    }
    printf("未找到该学生！\n");
}

// 修改学生成绩
void modify_score() {
    int id;
    printf("请输入要修改成绩的学生学号：");
    scanf("%d", &id);
    Student *current = head;
    while (current != NULL) {
        if (current->id == id) {
            printf("请输入新的成绩：");
            scanf("%f", &current->score);
            printf("修改成功！\n");
            return;
        }
        current = current->next;
    }
    printf("未找到该学生！\n");
}

// 查询学生成绩
void query_score() {
    int id;
    printf("请输入要查询成绩的学生学号：");
    scanf("%d", &id);
    Student *current = head;
    while (current != NULL) {
        if (current->id == id) {
            printf("学生姓名：%s\n", current->name);
            printf("学生学号：%d\n", current->id);
            printf("学生成绩：%.2f\n", current->score);
            return;
        }
        current = current->next;
    }
    printf("未找到该学生！\n");
}

// 显示所有学生信息
void display_all() {
    Student *current = head;
    while (current != NULL) {
        printf("学生姓名：%s\n", current->name);
        printf("学生学号：%d\n", current->id);
        printf("学生成绩：%.2f\n", current->score);
        current = current->next;
    }
}

// 主函数
int main() {
    int choice;
    while (1) {
        printf("\n");
        printf("1. 添加学生信息\n");
        printf("2. 删除学生信息\n");
        printf("3. 修改学生成绩\n");
        printf("4. 查询学生成绩\n");
        printf("5. 显示所有学生信息\n");
        printf("6. 退出\n");        printf("请输入操作编号：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                delete_student();
                break;
            case 3:
                modify_score();
                break;
            case 4:
                query_score();
                break;
            case 5:
                display_all();
                break;
            case 6:
                exit(0);
            default:
                printf("无效的操作编号！\n");
        }
    }
    return 0;
}