学生管理系统C语言

学生管理系统是一种常见的应用程序，用于管理学生的基本信息、课程信息、成绩信息等。下面是使用 C 语言实现一个简单的学生管理系统的示例代码：

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

#define MAX_STUDENT_NUM 100
#define MAX_NAME_LEN 20

typedef struct student {
    char name[MAX_NAME_LEN];
    int age;
    int score;
} Student;

Student students[MAX_STUDENT_NUM];
int student_num = 0;

void add_student() {
    if (student_num >= MAX_STUDENT_NUM) {
        printf("The maximum number of students has been reached.\n");
        return;
    }
    printf("Please enter the student's name:\n");
    scanf("%s", students[student_num].name);
    printf("Please enter the student's age:\n");
    scanf("%d", &students[student_num].age);
    printf("Please enter the student's score:\n");
    scanf("%d", &students[student_num].score);
    student_num++;
}

void show_students() {
    printf("Name\tAge\tScore\n");
    for (int i = 0; i < student_num; i++) {
        printf("%s\t%d\t%d\n", students[i].name, students[i].age, students[i].score);
    }
}

void find_student() {
    char name[MAX_NAME_LEN];
    printf("Please enter the name of the student you want to find:\n");
    scanf("%s", name);
    for (int i = 0; i < student_num; i++) {
        if (strcmp(name, students[i].name) == 0) {
            printf("Name\tAge\tScore\n");
            printf("%s\t%d\t%d\n", students[i].name, students[i].age, students[i].score);
            return;
        }
    }
    printf("The student named %s is not found.\n", name);
}

int main() {
    int choice;
    while (1) {
        printf("Please select the operation you want to perform:\n");
        printf("1. Add student\n");
        printf("2. Show all students\n");
        printf("3. Find student\n");
        printf("4. Exit\n");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                add_student();
                break;
            case 2:
                show_students();
                break;
            case 3:
                find_student();
                break;
            case 4:
                return 0;
            default:
                printf("Invalid choice.\n");
        }
    }
}

该程序使用结构体存储学生信息，并提供了添加学生、查看所有学生和查找学生等操作。用户可以通过菜单选择要执行的操作，并按照提示输入相应的信息。