复杂的学生签到考勤系统C语言代码

以下是一个简单的基于C语言的学生签到考勤系统代码。这个代码实现了基本的签到功能，包括输入学生信息、保存学生信息、识别学生信息、记录签到信息等。

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

#define MAX_STUDENT 1000
#define MAX_NAME 30

struct Student {
    char name[MAX_NAME];
    int id;
    int age;
    char gender;
    int isPresent;
};

// 根据名字查找学生
int findStudentByName(struct Student students[], int n, char name[]) {
    for (int i = 0; i < n; i++) {
        if (strcmp(students[i].name, name) == 0) {
            return i;
        }
    }
    return -1;
}

// 根据ID查找学生
int findStudentById(struct Student students[], int n, int id) {
    for (int i = 0; i < n; i++) {
        if (students[i].id == id) {
            return i;
        }
    }
    return -1;
}

// 添加学生
void addStudent(struct Student students[], int *n) {
    struct Student student;
    printf("请输入学生姓名：");
    scanf("%s", student.name);
    printf("请输入学生ID：");
    scanf("%d", &student.id);
    printf("请输入学生年龄：");
    scanf("%d", &student.age);
    printf("请输入学生性别：");
    scanf("%s", &student.gender);
    student.isPresent = 0;
    students[*n] = student;
    (*n)++;
}

// 识别学生信息
void recognizeStudent(struct Student students[], int n) {
    char name[MAX_NAME];
    printf("请输入学生姓名：");
    scanf("%s", name);
    int index = findStudentByName(students, n, name);
    if (index == -1) {
        printf("未找到该学生！\n");
    } else {
        printf("学生信息：\n");
        printf("姓名：%s\n", students[index].name);
        printf("ID：%d\n", students[index].id);
        printf("年龄：%d\n", students[index].age);
        printf("性别：%c\n", students[index].gender);
    }
}

// 记录签到信息
void recordAttendance(struct Student students[], int n) {
    char name[MAX_NAME];
    printf("请输入学生姓名：");
    scanf("%s", name);
    int index = findStudentByName(students, n, name);
    if (index == -1) {
        printf("未找到该学生！\n");
    } else {
        students[index].isPresent = 1;
        printf("学生：%s 签到成功！\n", name);
    }
}

// 显示所有学生信息
void showAllStudents(struct Student students[], int n) {
    printf("所有学生信息：\n");
    for (int i = 0; i < n; i++) {
        printf("姓名：%s，ID：%d，年龄：%d，性别：%c，是否签到：%s\n", students[i].name, students[i].id, students[i].age, students[i].gender, students[i].isPresent ? "是" : "否");
    }
}

int main() {
    struct Student students[MAX_STUDENT];
    int n = 0;
    int choice;
    do {
        printf("请选择操作：\n");
        printf("1.添加学生\n");
        printf("2.识别学生信息\n");
        printf("3.记录签到信息\n");
        printf("4.显示所有学生信息\n");
        printf("5.退出\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                addStudent(students, &n);
                break;
            case 2:
                recognizeStudent(students, n);
                break;
            case 3:
                recordAttendance(students, n);
                break;
            case 4:
                showAllStudents(students, n);
                break;
            case 5:
                break;
            default:
                printf("无效操作！\n");
                break;
        }
    } while (choice != 5);
    return 0;
}

这个代码使用结构体存储学生信息，通过输入进行添加学生、识别学生信息、记录签到信息等操作。同时，代码也提供了一个简单的菜单来帮助用户进行操作选择。