学生信息管理系统C语言

学生信息管理系统是一个常见的项目，可以用 C 语来实现。以下是一个简单的示例：

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

#define MAX_STUDENTS 100

struct student {
    char name[50];
    int age;
    float gpa;
};

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

    while (1) {
        printf("\n1. Add student\n");
        printf("2. View all students\n");
        printf("3. Search by name\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 s;
                printf("Enter student name: ");
                scanf("%s", s.name);
                printf("Enter student age: ");
                scanf("%d", &s.age);
                printf("Enter student GPA: ");
                scanf("%f", &s.gpa);

                students[num_students++] = s;
                printf("Student added successfully.\n");
                break;
            }
            case 2: {
                if (num_students == 0) {
                    printf("No students to display.\n");
                    break;
                }

                printf("All students:\n");
                for (int i = 0; i < num_students; i++) {
                    printf("%s, %d years old, GPA %.2f\n", students[i].name, students[i].age, students[i].gpa);
                }
                break;
            }
            case 3: {
                if (num_students == 0) {
                    printf("No students to search.\n");
                    break;
                }

                char name[50];
                printf("Enter student name to search: ");
                scanf("%s", name);

                int found = 0;
                for (int i = 0; i < num_students; i++) {
                    if (strcmp(students[i].name, name) == 0) {
                        printf("%s, %d years old, GPA %.2f\n", students[i].name, students[i].age, students[i].gpa);
                        found = 1;
                    }
                }

                if (!found) {
                    printf("No students found with name %s.\n", name);
                }
                break;
            }
            case 4: {
                printf("Exiting...\n");
                exit(0);
            }
            default: {
                printf("Invalid choice. Try again.\n");
                break;
            }
        }
    }

    return 0;
}

这个程序使用一个结构体 `student` 来存储每个学生的信息，包括姓名、年龄和 GPA。主函数中定义了一个 `students` 数组来存储所有学生的信息。程序包含一个菜单，可以让用户选择添加、查看或搜索学生信息，或者退出程序。每次添加学生信息时，程序会检查是否已经达到了最大学生数。每次搜索学生信息时，程序会遍历 `students` 数组，查找与搜索关键字匹配的学生信息。