如何用C语言做简单的学生管理系统

下面是一个简单的学生管理系统的 C 语言代码示例：

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

#define MAX_STUDENTS 100

struct student {
    int id;
    char name[20];
    int age;
    float score;
};

int main() {
    struct student students[MAX_STUDENTS];
    int num_students = 0;

    int choice;
    do {
        printf("1. Add student\n");
        printf("2. Print all students\n");
        printf("3. Search student by ID\n");
        printf("4. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                if (num_students == MAX_STUDENTS) {
                    printf("Error: maximum number of students reached.\n");
                    break;
                }

                struct student new_student;
                printf("Enter student ID: ");
                scanf("%d", &new_student.id);

                printf("Enter student name: ");
                scanf("%s", new_student.name);

                printf("Enter student age: ");
                scanf("%d", &new_student.age);

                printf("Enter student score: ");
                scanf("%f", &new_student.score);

                students[num_students++] = new_student;
                printf("Student added successfully.\n");
                break;

            case 2:
                if (num_students == 0) {
                    printf("No students found.\n");
                    break;
                }

                printf("ID\tName\tAge\tScore\n");
                for (int i = 0; i < num_students; i++) {
                    printf("%d\t%s\t%d\t%.2f\n",
                           students[i].id,
                           students[i].name,
                           students[i].age,
                           students[i].score);
                }
                break;

            case 3:
                if (num_students == 0) {
                    printf("No students found.\n");
                    break;
                }

                int search_id;
                printf("Enter student ID: ");
                scanf("%d", &search_id);

                for (int i = 0; i < num_students; i++) {
                    if (students[i].id == search_id) {
                        printf("ID\tName\tAge\tScore\n");
                        printf("%d\t%s\t%d\t%.2f\n",
                               students[i].id,
                               students[i].name,
                               students[i].age,
                               students[i].score);
                        break;
                    }
                }
                printf("Student not found.\n");
                break;

            case 4:
                printf("Exiting program.\n");
                break;

            default:
                printf("Invalid choice. Please try again.\n");
                break;
        }
    } while (choice != 4);

    return 0;
}

这个程序使用结构体来存储学生信息，并且可以添加新学生、打印所有学生和按 ID 搜索学生。你可以根据自己的需要对它进行修改和扩展。