parent
2d1f258cdf
commit
b26017fa52
@ -0,0 +1,506 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#define MAX_STUDENTS 100
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#define MAX_NAME_LEN 50
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#define MAX_ID_LEN 20
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#define MAX_MAJOR_LEN 50
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#define MAX_AWARDS_LEN 200
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#define DATA_FILE "students.dat"
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typedef struct {
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char id[MAX_ID_LEN];
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char name[MAX_NAME_LEN];
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char gender; // 'M' 或 'F'
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int age;
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char major[MAX_MAJOR_LEN];
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float gpa;
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char awards[MAX_AWARDS_LEN];
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} Student;
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Student students[MAX_STUDENTS];
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int student_count = 0;
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// 函数声明
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void load_data();
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void save_data();
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void add_student();
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void delete_student();
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void update_student();
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void search_student();
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void display_student(Student s);
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void list_all_students();
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void sort_students();
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void evaluate_students();
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void statistics();
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void show_menu();
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void clear_input_buffer();
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int main() {
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load_data();
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while (1) {
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show_menu();
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printf("请选择操作(1-9): ");
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char choice;
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scanf(" %c", &choice);
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clear_input_buffer();
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switch (choice) {
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case '1': add_student(); break;
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case '2': delete_student(); break;
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case '3': update_student(); break;
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case '4': search_student(); break;
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case '5': list_all_students(); break;
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case '6': sort_students(); break;
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case '7': evaluate_students(); break;
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case '8': statistics(); break;
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case '9':
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save_data();
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printf("感谢使用，再见!\n");
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exit(0);
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default:
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printf("无效的选择，请重新输入!\n");
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}
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}
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return 0;
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}
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void load_data() {
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FILE *file = fopen(DATA_FILE, "rb");
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if (file == NULL) {
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return; // 文件不存在，无需加载
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}
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student_count = fread(students, sizeof(Student), MAX_STUDENTS, file);
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fclose(file);
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}
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void save_data() {
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FILE *file = fopen(DATA_FILE, "wb");
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if (file == NULL) {
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printf("无法保存数据!\n");
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return;
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}
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fwrite(students, sizeof(Student), student_count, file);
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fclose(file);
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}
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void add_student() {
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if (student_count >= MAX_STUDENTS) {
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printf("学生数量已达上限，无法添加!\n");
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return;
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}
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printf("\n--- 添加学生信息 ---\n");
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Student s;
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printf("请输入学号: ");
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fgets(s.id, MAX_ID_LEN, stdin);
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s.id[strcspn(s.id, "\n")] = '\0'; // 移除换行符
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// 检查学号是否已存在
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for (int i = 0; i < student_count; i++) {
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if (strcmp(students[i].id, s.id) == 0) {
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printf("错误: 该学号已存在!\n");
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return;
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}
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}
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printf("请输入姓名: ");
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fgets(s.name, MAX_NAME_LEN, stdin);
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s.name[strcspn(s.name, "\n")] = '\0';
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printf("请输入性别(M/F): ");
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scanf(" %c", &s.gender);
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clear_input_buffer();
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s.gender = toupper(s.gender);
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printf("请输入年龄: ");
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scanf("%d", &s.age);
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clear_input_buffer();
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printf("请输入专业: ");
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fgets(s.major, MAX_MAJOR_LEN, stdin);
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s.major[strcspn(s.major, "\n")] = '\0';
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printf("请输入GPA(0-4): ");
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scanf("%f", &s.gpa);
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clear_input_buffer();
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printf("请输入获奖情况: ");
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fgets(s.awards, MAX_AWARDS_LEN, stdin);
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s.awards[strcspn(s.awards, "\n")] = '\0';
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students[student_count++] = s;
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save_data();
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printf("学生信息添加成功!\n");
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}
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void delete_student() {
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printf("\n--- 删除学生信息 ---\n");
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char id[MAX_ID_LEN];
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printf("请输入要删除的学生学号: ");
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fgets(id, MAX_ID_LEN, stdin);
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id[strcspn(id, "\n")] = '\0';
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for (int i = 0; i < student_count; i++) {
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if (strcmp(students[i].id, id) == 0) {
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// 将最后一个学生移到当前位置
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if (i < student_count - 1) {
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students[i] = students[student_count - 1];
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}
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student_count--;
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save_data();
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printf("学生信息删除成功!\n");
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return;
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}
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}
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printf("错误: 未找到该学号的学生!\n");
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}
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void update_student() {
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printf("\n--- 修改学生信息 ---\n");
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char id[MAX_ID_LEN];
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printf("请输入要修改的学生学号: ");
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fgets(id, MAX_ID_LEN, stdin);
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id[strcspn(id, "\n")] = '\0';
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for (int i = 0; i < student_count; i++) {
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if (strcmp(students[i].id, id) == 0) {
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printf("当前学生信息:\n");
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display_student(students[i]);
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printf("\n请输入新的信息(留空则保持不变):\n");
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char input[MAX_NAME_LEN];
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printf("姓名[%s]: ", students[i].name);
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fgets(input, MAX_NAME_LEN, stdin);
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input[strcspn(input, "\n")] = '\0';
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if (strlen(input) > 0) {
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strcpy(students[i].name, input);
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}
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printf("性别[%c]: ", students[i].gender);
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char gender;
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scanf(" %c", &gender);
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clear_input_buffer();
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if (gender != '\n') {
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students[i].gender = toupper(gender);
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}
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printf("年龄[%d]: ", students[i].age);
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fgets(input, MAX_NAME_LEN, stdin);
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input[strcspn(input, "\n")] = '\0';
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if (strlen(input) > 0) {
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students[i].age = atoi(input);
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}
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printf("专业[%s]: ", students[i].major);
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fgets(input, MAX_MAJOR_LEN, stdin);
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input[strcspn(input, "\n")] = '\0';
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if (strlen(input) > 0) {
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strcpy(students[i].major, input);
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}
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printf("GPA[%.2f]: ", students[i].gpa);
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fgets(input, MAX_NAME_LEN, stdin);
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input[strcspn(input, "\n")] = '\0';
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if (strlen(input) > 0) {
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students[i].gpa = atof(input);
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}
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printf("获奖情况[%s]: ", students[i].awards);
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fgets(input, MAX_AWARDS_LEN, stdin);
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input[strcspn(input, "\n")] = '\0';
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if (strlen(input) > 0) {
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strcpy(students[i].awards, input);
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}
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save_data();
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printf("学生信息修改成功!\n");
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return;
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}
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}
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printf("错误: 未找到该学号的学生!\n");
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}
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void search_student() {
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printf("\n--- 查询学生信息 ---\n");
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printf("1. 按学号查询\n");
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printf("2. 按姓名查询\n");
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printf("3. 按专业查询\n");
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printf("请选择查询方式(1-3): ");
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char choice;
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scanf(" %c", &choice);
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clear_input_buffer();
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char query[MAX_NAME_LEN];
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int found = 0;
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switch (choice) {
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case '1':
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printf("请输入学号: ");
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fgets(query, MAX_ID_LEN, stdin);
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query[strcspn(query, "\n")] = '\0';
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printf("\n查询结果:\n");
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for (int i = 0; i < student_count; i++) {
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if (strcmp(students[i].id, query) == 0) {
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display_student(students[i]);
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found = 1;
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}
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}
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break;
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case '2':
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printf("请输入姓名: ");
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fgets(query, MAX_NAME_LEN, stdin);
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query[strcspn(query, "\n")] = '\0';
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printf("\n查询结果:\n");
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for (int i = 0; i < student_count; i++) {
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if (strstr(students[i].name, query) != NULL) {
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display_student(students[i]);
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found = 1;
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}
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}
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break;
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case '3':
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printf("请输入专业: ");
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fgets(query, MAX_MAJOR_LEN, stdin);
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query[strcspn(query, "\n")] = '\0';
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printf("\n查询结果:\n");
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for (int i = 0; i < student_count; i++) {
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if (strstr(students[i].major, query) != NULL) {
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display_student(students[i]);
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found = 1;
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}
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}
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break;
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default:
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printf("无效的选择!\n");
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return;
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}
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if (!found) {
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printf("未找到符合条件的学生!\n");
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}
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}
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void display_student(Student s) {
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printf("\n学号: %s\n", s.id);
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printf("姓名: %s\n", s.name);
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printf("性别: %c\n", s.gender);
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printf("年龄: %d\n", s.age);
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printf("专业: %s\n", s.major);
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printf("GPA: %.2f\n", s.gpa);
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printf("获奖情况: %s\n", s.awards);
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printf("------------------------------\n");
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}
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void list_all_students() {
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printf("\n--- 所有学生信息 ---\n");
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if (student_count == 0) {
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printf("没有学生信息!\n");
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return;
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}
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for (int i = 0; i < student_count; i++) {
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display_student(students[i]);
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}
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}
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void sort_students() {
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printf("\n--- 排序学生信息 ---\n");
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printf("1. 按学号排序\n");
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printf("2. 按姓名排序\n");
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printf("3. 按GPA排序\n");
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printf("4. 按年龄排序\n");
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printf("请选择排序方式(1-4): ");
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char choice;
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scanf(" %c", &choice);
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clear_input_buffer();
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// 简单的冒泡排序
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for (int i = 0; i < student_count - 1; i++) {
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for (int j = 0; j < student_count - i - 1; j++) {
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int swap = 0;
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switch (choice) {
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case '1':
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if (strcmp(students[j].id, students[j+1].id) > 0) {
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swap = 1;
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}
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break;
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case '2':
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if (strcmp(students[j].name, students[j+1].name) > 0) {
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swap = 1;
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}
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break;
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case '3':
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if (students[j].gpa < students[j+1].gpa) {
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swap = 1;
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}
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break;
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case '4':
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if (students[j].age > students[j+1].age) {
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swap = 1;
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}
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break;
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default:
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printf("无效的选择!\n");
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return;
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}
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if (swap) {
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Student temp = students[j];
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students[j] = students[j+1];
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students[j+1] = temp;
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}
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}
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}
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save_data();
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printf("排序完成!\n");
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list_all_students();
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}
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void evaluate_students() {
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printf("\n--- 学生评优评奖 ---\n");
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printf("1. 显示GPA前3名的学生\n");
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printf("2. 显示有获奖记录的学生\n");
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printf("请选择评优方式(1-2): ");
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char choice;
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scanf(" %c", &choice);
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clear_input_buffer();
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switch (choice) {
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case '1': {
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// 先按GPA排序
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for (int i = 0; i < student_count - 1; i++) {
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for (int j = 0; j < student_count - i - 1; j++) {
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if (students[j].gpa < students[j+1].gpa) {
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Student temp = students[j];
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students[j] = students[j+1];
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students[j+1] = temp;
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}
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}
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}
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int limit = student_count < 3 ? student_count : 3;
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printf("\nGPA前%d名的学生:\n", limit);
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for (int i = 0; i < limit; i++) {
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display_student(students[i]);
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}
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break;
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}
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case '2': {
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int found = 0;
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printf("\n有获奖记录的学生:\n");
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for (int i = 0; i < student_count; i++) {
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if (strlen(students[i].awards) > 0) {
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display_student(students[i]);
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found = 1;
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}
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}
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if (!found) {
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printf("没有学生有获奖记录!\n");
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}
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break;
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}
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default:
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printf("无效的选择!\n");
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}
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}
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void statistics() {
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printf("\n--- 统计信息 ---\n");
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printf("总学生数: %d\n", student_count);
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if (student_count == 0) {
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return;
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}
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// 按性别统计
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int male_count = 0, female_count = 0;
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for (int i = 0; i < student_count; i++) {
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if (toupper(students[i].gender) == 'M') {
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male_count++;
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} else {
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female_count++;
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}
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}
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printf("男生人数: %d, 女生人数: %d\n", male_count, female_count);
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// 平均GPA
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float total_gpa = 0;
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for (int i = 0; i < student_count; i++) {
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total_gpa += students[i].gpa;
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}
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printf("平均GPA: %.2f\n", total_gpa / student_count);
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// 按专业统计
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printf("\n各专业人数:\n");
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char majors[MAX_STUDENTS][MAX_MAJOR_LEN];
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int counts[MAX_STUDENTS] = {0};
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int major_count = 0;
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for (int i = 0; i < student_count; i++) {
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int found = 0;
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for (int j = 0; j < major_count; j++) {
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if (strcmp(majors[j], students[i].major) == 0) {
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counts[j]++;
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found = 1;
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break;
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}
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}
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if (!found) {
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strcpy(majors[major_count], students[i].major);
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counts[major_count] = 1;
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major_count++;
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}
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}
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for (int i = 0; i < major_count; i++) {
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printf("%s: %d人\n", majors[i], counts[i]);
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}
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}
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void show_menu() {
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printf("\n=== 学生信息管理系统 ===\n");
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printf("1. 添加学生信息\n");
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printf("2. 删除学生信息\n");
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printf("3. 修改学生信息\n");
|
||||
printf("4. 查询学生信息\n");
|
||||
printf("5. 显示所有学生\n");
|
||||
printf("6. 排序学生信息\n");
|
||||
printf("7. 学生评优评奖\n");
|
||||
printf("8. 统计信息\n");
|
||||
printf("9. 退出系统\n");
|
||||
}
|
||||
|
||||
void clear_input_buffer() {
|
||||
while (getchar() != '\n');
|
||||
}
|
||||
Loading…
Reference in new issue