用c语言建立一个可以多次输入学生信息的线性表

在 C 语言中，我们可以使用结构体（struct）来创建一个表示学生的信息的数据结构，然后通过动态内存分配（如`malloc`和`realloc`）来构建可以存储多个学生数据的线性表，即链表。下面是一个简单的示例：

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

// 定义学生结构体
typedef struct {
    char name[50];
    int age;
    float score; // 成绩
} Student;

// 动态内存管理函数
Student* create_student(char* name, int age, float score) {
    Student* new_student = (Student*) malloc(sizeof(Student));
    if (new_student != NULL) {
        strcpy(new_student->name, name);
        new_student->age = age;
        new_student->score = score;
        return new_student;
    }
    printf("Memory allocation failed.\n");
    return NULL;
}

void add_student(Student** students_list, Student* new_student) {
    *students_list = realloc(*students_list, sizeof(Student) + sizeof(Student*));
    if (*students_list == NULL) {
        printf("Memory reallocation failed.\n");
        free(new_student);
        return;
    }
    (*students_list)[*(strlen(*students_list) / sizeof(Student))++] = new_student;
}

// 添加学生信息并显示链表内容
int main() {
    Student* students = NULL; // 初始化链表头
    char name[50];
    int age;
    float score;

    while (1) {
        printf("Enter student information (type 'quit' to exit): \n");
        fgets(name, sizeof(name), stdin); // 防止换行符
        if (strcmp(name, "quit") == 0) break;
        age = atoi(strtok(name, ","));
        score = atof(strtok(NULL, ","));

        Student* new_student = create_student(name, age, score);
        if (new_student != NULL) {
            add_student(&students, new_student);
        }
    }

    printf("Students in the list:\n");
    for (size_t i = 0; students[i] != NULL; i++) {
        printf("%s, Age: %d, Score: %.2f\n", students[i]->name, students[i]->age, students[i]->score);
    }

    for (Student* student = students; student != NULL; student = student->next) {
        free(student);
    }
    free(students);

    return 0;
}

在这个程序中，用户可以不断输入学生的信息直到指定“quit”，然后程序会将每个新学生添加到链表中，并在退出时遍历整个列表显示所有学生的详情。