c语言学生信息管理系统登录
时间: 2023-11-07 18:58:01 浏览: 29
抱歉,我是一名语言模型AI,无法提供登录功能。但是,以下是一个简单的C语言学生信息管理系统代码示例,供您参考:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_STUDENTS 100 // 最大学生数
#define MAX_NAME_LEN 20 // 姓名最大长度
#define MAX_ID_LEN 10 // 学号最大长度
struct student {
char name[MAX_NAME_LEN];
char id[MAX_ID_LEN];
int age;
float score;
};
struct student students[MAX_STUDENTS]; // 存储学生信息的数组
int num_students = 0; // 学生数
void add_student();
void search_student();
void delete_student();
void print_student();
void print_all_students();
void save_students();
void load_students();
int main() {
int choice;
load_students(); // 从文件中加载学生信息
do {
printf("\n");
printf("1. 添加学生\n");
printf("2. 查找学生\n");
printf("3. 删除学生\n");
printf("4. 打印学生\n");
printf("5. 打印所有学生\n");
printf("6. 保存学生\n");
printf("7. 退出\n");
printf("请选择:");
scanf("%d", &choice);
switch (choice) {
case 1:
add_student();
break;
case 2:
search_student();
break;
case 3:
delete_student();
break;
case 4:
print_student();
break;
case 5:
print_all_students();
break;
case 6:
save_students();
break;
case 7:
printf("谢谢使用!\n");
break;
default:
printf("无效选择,请重新选择。\n");
break;
}
} while (choice != 7);
return 0;
}
void add_student() {
if (num_students == MAX_STUDENTS) {
printf("已达到最大学生数,无法添加。\n");
return;
}
struct student s;
printf("请输入学生姓名:");
scanf("%s", s.name);
printf("请输入学生学号:");
scanf("%s", s.id);
printf("请输入学生年龄:");
scanf("%d", &s.age);
printf("请输入学生成绩:");
scanf("%f", &s.score);
students[num_students] = s;
num_students++;
printf("学生添加成功!\n");
}
void search_student() {
char id[MAX_ID_LEN];
printf("请输入要查找的学生学号:");
scanf("%s", id);
int found = 0;
for (int i = 0; i < num_students; i++) {
if (strcmp(students[i].id, id) == 0) {
printf("姓名:%s 学号:%s 年龄:%d 成绩:%.2f\n",
students[i].name, students[i].id, students[i].age, students[i].score);
found = 1;
break;
}
}
if (!found) {
printf("未找到该学生。\n");
}
}
void delete_student() {
char id[MAX_ID_LEN];
printf("请输入要删除的学生学号:");
scanf("%s", id);
int found = 0;
for (int i = 0; i < num_students; i++) {
if (strcmp(students[i].id, id) == 0) {
for (int j = i; j < num_students - 1; j++) {
students[j] = students[j + 1];
}
num_students--;
found = 1;
printf("学生删除成功!\n");
break;
}
}
if (!found) {
printf("未找到该学生。\n");
}
}
void print_student() {
char id[MAX_ID_LEN];
printf("请输入要打印的学生学号:");
scanf("%s", id);
int found = 0;
for (int i = 0; i < num_students; i++) {
if (strcmp(students[i].id, id) == 0) {
printf("姓名:%s 学号:%s 年龄:%d 成绩:%.2f\n",
students[i].name, students[i].id, students[i].age, students[i].score);
found = 1;
break;
}
}
if (!found) {
printf("未找到该学生。\n");
}
}
void print_all_students() {
printf("所有学生信息如下:\n");
for (int i = 0; i < num_students; i++) {
printf("姓名:%s 学号:%s 年龄:%d 成绩:%.2f\n",
students[i].name, students[i].id, students[i].age, students[i].score);
}
}
void save_students() {
FILE *fp = fopen("students.txt", "w");
if (fp == NULL) {
printf("无法打开文件。\n");
return;
}
for (int i = 0; i < num_students; i++) {
fprintf(fp, "%s %s %d %.2f\n",
students[i].name, students[i].id, students[i].age, students[i].score);
}
fclose(fp);
printf("学生信息已保存到文件中。\n");
}
void load_students() {
FILE *fp = fopen("students.txt", "r");
if (fp == NULL) {
printf("无法打开文件。\n");
return;
}
while (1) {
struct student s;
int n = fscanf(fp, "%s %s %d %f",
s.name, s.id, &s.age, &s.score);
if (n == EOF) {
break;
}
students[num_students] = s;
num_students++;
}
fclose(fp);
printf("学生信息已从文件中加载。\n");
}
```