c语言学生考勤系统代码

以下是一个简单的 C 语言学生考勤系统的代码示例：

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

#define MAX_STUDENTS 100
#define MAX_NAME_LENGTH 50

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

void addStudent(struct Student students[], int *numStudents);
void printAttendance(struct Student students[], int numStudents);
void updateAttendance(struct Student students[], int numStudents);

int main() {
    struct Student students[MAX_STUDENTS];
    int numStudents = 0;
    int choice;

    while (1) {
        printf("\n1. Add student\n");
        printf("2. Print attendance\n");
        printf("3. Update attendance\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                addStudent(students, &numStudents);
                break;
            case 2:
                printAttendance(students, numStudents);
                break;
            case 3:
                updateAttendance(students, numStudents);
                break;
            case 4:
                exit(0);
            default:
                printf("\nInvalid choice. Try again.\n");
                break;
        }
    }

    return 0;
}

void addStudent(struct Student students[], int *numStudents) {
    if (*numStudents == MAX_STUDENTS) {
        printf("\nMaximum number of students reached.\n");
        return;
    }

    struct Student newStudent;
    printf("\nEnter student name: ");
    scanf("%s", newStudent.name);
    printf("Enter student ID: ");
    scanf("%d", &newStudent.id);
    newStudent.attendance = 0;

    students[*numStudents] = newStudent;
    (*numStudents)++;

    printf("\nStudent added successfully.\n");
}

void printAttendance(struct Student students[], int numStudents) {
    printf("\nName\tID\tAttendance\n");
    for (int i = 0; i < numStudents; i++) {
        printf("%s\t%d\t%d\n", students[i].name, students[i].id, students[i].attendance);
    }
}

void updateAttendance(struct Student students[], int numStudents) {
    int id;
    printf("\nEnter student ID: ");
    scanf("%d", &id);

    int found = 0;
    for (int i = 0; i < numStudents; i++) {
        if (students[i].id == id) {
            students[i].attendance++;
            printf("\nAttendance updated successfully.\n");
            found = 1;
            break;
        }
    }

    if (!found) {
        printf("\nStudent not found.\n");
    }
}

这个程序使用一个 `struct` 结构体来存储每个学生的姓名、ID 和出勤情况。主函数通过一个无限循环来提供用户菜单，用户可以选择添加学生、打印出勤情况或更新某个学生的出勤情况。