定义一个结构体表示学生成绩，包含学生学号、姓名、数学成绩、语文成绩、英语成绩等信息。然后定义一个数组，存储多个学生的成绩信息。实现查找可以遍历数组，根据姓名查找对应学生的成绩信息。插入可以在数组末尾添加一个新的学生成绩信息。删除可以根据学号或姓名查找到对应学生的成绩信息，然后将其从数组中删除。修改可以根据姓名查找到对应学生的成绩信息，然后修改其数学成绩、语文成绩、英语成绩等信息。使用C语言实现

以下是C语言实现：

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

#define MAX_STUDENT_NUM 100

struct Student {
    char id[20];
    char name[20];
    int math_score;
    int chinese_score;
    int english_score;
};

struct Student students[MAX_STUDENT_NUM];
int student_num = 0;

void print_student(struct Student student) {
    printf("id: %s, name: %s, math score: %d, chinese score: %d, english score: %d\n",
           student.id, student.name, student.math_score, student.chinese_score, student.english_score);
}

void print_all_students() {
    for (int i = 0; i < student_num; i++) {
        print_student(students[i]);
    }
}

void insert_student(struct Student student) {
    if (student_num >= MAX_STUDENT_NUM) {
        printf("Error: too many students\n");
        return;
    }
    students[student_num++] = student;
}

void delete_student_by_id(char* id) {
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            for (int j = i; j < student_num - 1; j++) {
                students[j] = students[j + 1];
            }
            student_num--;
            return;
        }
    }
    printf("Error: student not found\n");
}

void delete_student_by_name(char* name) {
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            for (int j = i; j < student_num - 1; j++) {
                students[j] = students[j + 1];
            }
            student_num--;
            return;
        }
    }
    printf("Error: student not found\n");
}

void modify_student(char* name, int math_score, int chinese_score, int english_score) {
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            students[i].math_score = math_score;
            students[i].chinese_score = chinese_score;
            students[i].english_score = english_score;
            return;
        }
    }
    printf("Error: student not found\n");
}

void search_student_by_name(char* name) {
    for (int i = 0; i < student_num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            print_student(students[i]);
            return;
        }
    }
    printf("Error: student not found\n");
}

int main() {
    struct Student student1 = {"001", "Tom", 80, 90, 85};
    struct Student student2 = {"002", "Jerry", 70, 85, 90};
    insert_student(student1);
    insert_student(student2);
    print_all_students();
    delete_student_by_id("001");
    print_all_students();
    delete_student_by_name("Jerry");
    print_all_students();
    modify_student("Tom", 90, 95, 80);
    print_all_students();
    search_student_by_name("Tom");
    return 0;
}

这个程序定义了一个结构体`Student`表示学生成绩，包含学生学号、姓名、数学成绩、语文成绩、英语成绩等信息。然后定义了一个数组`students`，存储多个学生的成绩信息。实现了查找可以遍历数组，根据姓名查找对应学生的成绩信息。插入可以在数组末尾添加一个新的学生成绩信息。删除可以根据学号或姓名查找到对应学生的成绩信息，然后将其从数组中删除。修改可以根据姓名查找到对应学生的成绩信息，然后修改其数学成绩、语文成绩、英语成绩等信息。