用c语言写一个学籍管理系统

学籍管理系统主要包括以下功能：

1. 学生信息录入
2. 学生信息查询
3. 学生信息修改
4. 学生信息删除

下面是一个简单的学籍管理系统的代码，使用 C 语言实现：

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

#define MAX_STUDENT_NUM 100

typedef struct {
    char name[20];
    int age;
    char gender[6];
    char id[20];
    char department[20];
} Student;

Student students[MAX_STUDENT_NUM];
int student_num = 0;

void add_student() {
    if (student_num >= MAX_STUDENT_NUM) {
        printf("Student database is full.\n");
        return;
    }
    printf("Please input student's name, age, gender, id and department:\n");
    scanf("%s%d%s%s%s", students[student_num].name, &students[student_num].age,
          students[student_num].gender, students[student_num].id, students[student_num].department);
    student_num++;
    printf("Add student successfully.\n");
}

void search_student() {
    char id[20];
    printf("Please input student's id:\n");
    scanf("%s", id);
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("Name: %s, Age: %d, Gender: %s, Id: %s, Department: %s\n",
                   students[i].name, students[i].age, students[i].gender, students[i].id, students[i].department);
            return;
        }
    }
    printf("Can not find this student.\n");
}

void update_student() {
    char id[20];
    printf("Please input student's id:\n");
    scanf("%s", id);
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("Please input student's name, age, gender and department:\n");
            scanf("%s%d%s%s", students[i].name, &students[i].age,
                  students[i].gender, students[i].department);
            printf("Update student information successfully.\n");
            return;
        }
    }
    printf("Can not find this student.\n");
}

void delete_student() {
    char id[20];
    printf("Please input student's id:\n");
    scanf("%s", id);
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            for (int j = i; j < student_num - 1; j++) {
                students[j] = students[j + 1];
            }
            student_num--;
            printf("Delete student successfully.\n");
            return;
        }
    }
    printf("Can not find this student.\n");
}

void print_menu() {
    printf("\n");
    printf("********** Student Management System ***********\n");
    printf("* 1. Add student                               *\n");
    printf("* 2. Search student                            *\n");
    printf("* 3. Update student                            *\n");
    printf("* 4. Delete student                            *\n");
    printf("* 5. Exit                                      *\n");
    printf("************************************************\n");
    printf("\n");
}

int main() {
    int choice;
    while (1) {
        print_menu();
        printf("Please input your choice:\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                search_student();
                break;
            case 3:
                update_student();
                break;
            case 4:
                delete_student();
                break;
            case 5:
                printf("Exit.\n");
                return 0;
            default:
                printf("Invalid choice, please input again.\n");
                break;
        }
    }
    return 0;
}

上面的代码实现了一个简单的学籍管理系统，包括了添加学生、查询学生、修改学生和删除学生等功能。用户可以根据菜单提示进行操作。