学生考勤系统c语言代码

以下是一个简单的学生考勤系统的C语言代码，仅供参考：

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

#define MAX_STUDENTS 100
#define MAX_NAME_LENGTH 20

typedef struct {
    char name[MAX_NAME_LENGTH];
    int id;
    int attendance_count;
} Student;

int find_student(Student students[], int count, int id) {
    for (int i = 0; i < count; i++) {
        if (students[i].id == id) {
            return i;
        }
    }
    return -1;
}

void record_attendance(Student students[], int count) {
    int id;
    printf("Enter student ID: ");
    scanf("%d", &id);

    int index = find_student(students, count, id);
    if (index == -1) {
        printf("Student not found.\n");
        return;
    }

    students[index].attendance_count++;
    printf("Attendance recorded for %s.\n", students[index].name);
}

void print_summary(Student students[], int count) {
    printf("Attendance Summary:\n");
    for (int i = 0; i < count; i++) {
        printf("%s: %d\n", students[i].name, students[i].attendance_count);
    }
}

int main() {
    Student students[MAX_STUDENTS];
    int count = 0;

    int choice;
    do {
        printf("1. Add student\n");
        printf("2. Record attendance\n");
        printf("3. Print attendance summary\n");
        printf("4. Quit\n");
        printf("Enter choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1: {
                if (count >= MAX_STUDENTS) {
                    printf("Maximum number of students reached.\n");
                    break;
                }

                Student student;
                printf("Enter student name: ");
                scanf("%s", student.name);
                printf("Enter student ID: ");
                scanf("%d", &student.id);
                student.attendance_count = 0;

                students[count] = student;
                count++;

                printf("Student added.\n");
                break;
            }
            case 2:
                record_attendance(students, count);
                break;
            case 3:
                print_summary(students, count);
                break;
            case 4:
                printf("Goodbye!\n");
                break;
            default:
                printf("Invalid choice.\n");
                break;
        }

        printf("\n");
    } while (choice != 4);

    return 0;
}

此代码实现了以下功能：

- 添加学生（姓名和ID）
- 记录考勤
- 打印考勤汇总信息
- 退出系统

请注意，此代码仅作为参考，实际应用中可能需要更复杂的实现。