用c++写出学院考勤管理系统

以下是一个C++实现的学院考勤管理系统示例代码：

#include <iostream>
#include <cstring>

#define MAX_STUDENTS 100
#define MAX_NAME_LENGTH 50
#define MAX_ID_LENGTH 20

using namespace std;

struct student {
    char name[MAX_NAME_LENGTH];
    char id[MAX_ID_LENGTH];
    int presence_count;
};

void add_student(student *students, int &student_count) {
    if (student_count >= MAX_STUDENTS) {
        cout << "The maximum number of students has been reached." << endl;
        return;
    }
    student new_student;
    cout << "Enter student name: ";
    cin >> new_student.name;
    cout << "Enter student ID: ";
    cin >> new_student.id;
    new_student.presence_count = 0;
    students[student_count] = new_student;
    student_count++;
    cout << "Student added successfully." << endl;
}

void mark_presence(student *students, int student_count) {
    char id[MAX_ID_LENGTH];
    cout << "Enter student ID: ";
    cin >> id;
    for (int i = 0; i < student_count; i++) {
        if (strcmp(students[i].id, id) == 0) {
            students[i].presence_count++;
            cout << "Presence marked for student " << students[i].name << "." << endl;
            return;
        }
    }
    cout << "No student found with ID " << id << "." << endl;
}

void print_report(student *students, int student_count) {
    cout << "Student ID\tName\tPresence Count" << endl;
    for (int i = 0; i < student_count; i++) {
        cout << students[i].id << "\t" << students[i].name << "\t" << students[i].presence_count << endl;
    }
}

int main() {
    student students[MAX_STUDENTS];
    int student_count = 0;
    int choice;
    while (true) {
        cout << endl << "1. Add student" << endl;
        cout << "2. Mark presence" << endl;
        cout << "3. Print report" << endl;
        cout << "4. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;
        switch (choice) {
            case 1:
                add_student(students, student_count);
                break;
            case 2:
                mark_presence(students, student_count);
                break;
            case 3:
                print_report(students, student_count);
                break;
            case 4:
                exit(0);
            default:
                cout << "Invalid choice." << endl;
        }
        cin.clear();
        cin.ignore(10000, '\n');
    }
    return 0;
}

该程序与之前提供的C语言示例的实现思路类似，但使用了C++的特性，如结构体和字符串处理函数。程序中还添加了输入缓冲区的清除操作，以避免用户输入无效字符。