C语言实现学生成绩管理系统

C语言实现学生成绩管理系统的示例代码如下：

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

// 定义学生结构体
typedef struct Student {
    char name[20];
    int score;
    struct Student* next;
} Student;

// 全局变量，链表头指针
Student* g_pHead = NULL;

// 添加学生信息
void AddStudent() {
    Student* newStudent = (Student*)malloc(sizeof(Student));
    printf("请输入学生姓名：");
    scanf("%s", newStudent->name);
    printf("请输入学生成绩：");
    scanf("%d", &(newStudent->score));
    newStudent->next = NULL;

    if (g_pHead == NULL) {
        g_pHead = newStudent;
    } else {
        Student* p = g_pHead;
        while (p->next != NULL) {
            p = p->next;
        }
        p->next = newStudent;
    }

    printf("添加成功！\n\n");
    system("pause");
    system("cls");
}

// 统计所有学生人数
void CountStudent() {
    int countStu = 0;
    Student* p = g_pHead;
    while (p != NULL) {
        countStu++;
        p = p->next;
    }
    printf("学生总人数：%d\n\n", countStu);
    system("pause");
    system("cls");
}

// 查找学生信息
void SearchStudent() {
    char searchName[20];
    printf("请输入要查找的学生姓名：");
    scanf("%s", searchName);

    Student* p = g_pHead;
    while (p != NULL) {
        if (strcmp(p->name, searchName) == 0) {
            printf("学生姓名：%s\n", p->name);
            printf("学生成绩：%d\n\n", p->score);
            system("pause");
            system("cls");
            return;
        }
        p = p->next;
    }

    printf("未找到该学生！\n\n");
    system("pause");
    system("cls");
}

// 主函数
int main() {
    int choice;
    while (1) {
        printf("学生成绩管理系统\n");
        printf("1. 添加学生信息\n");
        printf("2. 统计所有学生人数\n");
        printf("3. 查找学生信息\n");
        printf("4. 退出\n");
        printf("请输入您的选择：");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                AddStudent();
                break;
            case 2:
                CountStudent();
                break;
            case 3:
                SearchStudent();
                break;
            case 4:
                exit(0);
            default:
                printf("输入有误，请重新输入！\n\n");
                system("pause");
                system("cls");
                break;
        }
    }

    return 0;
}