用C++代码定义一个包含学生信息（学号，姓名，成绩）的顺序表，使其具有如下功能

1. 初始化顺序表
2. 插入学生信息
3. 删除学生信息
4. 修改学生信息
5. 查找学生信息
6. 输出所有学生信息
7. 统计学生总数
8. 清空顺序表

以下是对应的C代码实现：

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

#define MAX_SIZE 100

typedef struct Student {
    int id;
    char name[20];
    float score;
} Student;

typedef struct SeqList {
    Student data[MAX_SIZE];
    int length;
} SeqList;

void init_list(SeqList *list) {
    list->length = 0;
}

int insert(SeqList *list, int pos, Student stu) {
    if (pos < 1 || pos > list->length + 1) {
        printf("Error: Invalid position\n");
        return 0;
    }
    if (list->length >= MAX_SIZE) {
        printf("Error: List is full\n");
        return 0;
    }
    for (int i = list->length; i >= pos; i--) {
        list->data[i] = list->data[i - 1];
    }
    list->data[pos - 1] = stu;
    list->length++;
    return 1;
}

int delete(SeqList *list, int pos) {
    if (pos < 1 || pos > list->length) {
        printf("Error: Invalid position\n");
        return 0;
    }
    for (int i = pos - 1; i < list->length - 1; i++) {
        list->data[i] = list->data[i + 1];
    }
    list->length--;
    return 1;
}

int modify(SeqList *list, int pos, Student stu) {
    if (pos < 1 || pos > list->length) {
        printf("Error: Invalid position\n");
        return 0;
    }
    list->data[pos - 1] = stu;
    return 1;
}

int search(SeqList *list, int id) {
    for (int i = 0; i < list->length; i++) {
        if (list->data[i].id == id) {
            return i + 1;
        }
    }
    return 0;
}

void print_all(SeqList *list) {
    printf("ID\tName\tScore\n");
    for (int i = 0; i < list->length; i++) {
        printf("%d\t%s\t%.2f\n", list->data[i].id, list->data[i].name, list->data[i].score);
    }
}

int count(SeqList *list) {
    return list->length;
}

void clear(SeqList *list) {
    list->length = 0;
}

int main() {
    SeqList list;
    init_list(&list);

    Student s1 = {1001, "Tom", 90};
    Student s2 = {1002, "Jerry", 85};
    Student s3 = {1003, "Mary", 95};

    insert(&list, 1, s1);
    insert(&list, 2, s2);
    insert(&list, 3, s3);

    print_all(&list);

    printf("Count: %d\n", count(&list));

    modify(&list, 2, (Student){1002, "John", 88});

    print_all(&list);

    printf("Search result: %d\n", search(&list, 1002));

    delete(&list, 1);

    print_all(&list);

    clear(&list);

    printf("Count: %d\n", count(&list));

    return 0;
}

输出结果：

ID    Name    Score
1001    Tom    90.00
1002    Jerry    85.00
1003    Mary    95.00
Count: 3
ID    Name    Score
1001    Tom    90.00
1002    John    88.00
1003    Mary    95.00
Search result: 2
ID    Name    Score
1002    John    88.00
1003    Mary    95.00
Count: 0