（1）用C语言实现系统； （2）设计一个信息管理系统，比如设计一学生信息管理系统， 学生信息包括：学号，姓名，性别，出生年月，电话，英语，数学，总成绩等。使之能提供以下功能： 1) 系统以菜单方式工作 2) 学生信息录入功能（学生信息用文件保存）---输入 3) 学生信息浏览功能---输出 4) 根据输入英语、数学成绩，计算总成绩。 5) 按学号查询 6) 按姓名查询 7) 按照总成绩进行排序 8) 学生信息的删除与修改（可选项）生成代码

很抱歉，我无法提供编写代码的服务，但是我可以给你提供一个参考的代码实现。

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

#define MAX_NAME_LEN 20
#define MAX_STUDENT_NUM 100

typedef struct {
    char id[10];
    char name[MAX_NAME_LEN];
    char gender[5];
    char birth[12];
    char phone[20];
    int english;
    int math;
    int total;
} Student;

Student students[MAX_STUDENT_NUM];
int student_count = 0;

int load_data(const char* file_name) {
    FILE* fp = fopen(file_name, "r");
    if (!fp) {
        return 0;
    }

    while (1) {
        Student* student = &students[student_count];
        int ret = fscanf(fp, "%s %s %s %s %s %d %d %d\n", student->id, student->name, student->gender, student->birth, student->phone, &student->english, &student->math, &student->total);
        if (ret != 8) {
            break;
        }
        student_count++;
    }

    fclose(fp);
    return 1;
}

int save_data(const char* file_name) {
    FILE* fp = fopen(file_name, "w");
    if (!fp) {
        return 0;
    }

    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        fprintf(fp, "%s %s %s %s %s %d %d %d\n", student->id, student->name, student->gender, student->birth, student->phone, student->english, student->math, student->total);
    }

    fclose(fp);
    return 1;
}

void add_student() {
    if (student_count >= MAX_STUDENT_NUM) {
        printf("Error: Student list is full!\n");
        return;
    }

    Student* student = &students[student_count];
    printf("Please input student ID: ");
    scanf("%s", student->id);
    printf("Please input student name: ");
    scanf("%s", student->name);
    printf("Please input student gender: ");
    scanf("%s", student->gender);
    printf("Please input student birth: ");
    scanf("%s", student->birth);
    printf("Please input student phone: ");
    scanf("%s", student->phone);
    printf("Please input student English score: ");
    scanf("%d", &student->english);
    printf("Please input student math score: ");
    scanf("%d", &student->math);

    student->total = student->english + student->math;
    student_count++;
}

void print_student(const Student* student) {
    printf("%s\t%s\t%s\t%s\t%s\t%d\t%d\t%d\n", student->id, student->name, student->gender, student->birth, student->phone, student->english, student->math, student->total);
}

void browse_students() {
    printf("ID\tName\tGender\tBirth\tPhone\tEnglish\tMath\tTotal\n");
    for (int i = 0; i < student_count; i++) {
        print_student(&students[i]);
    }
}

void calculate_total() {
    int english, math;
    printf("Please input English score: ");
    scanf("%d", &english);
    printf("Please input math score: ");
    scanf("%d", &math);

    printf("ID\tName\tGender\tBirth\tPhone\tEnglish\tMath\tTotal\n");
    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        if (student->english == english && student->math == math) {
            print_student(student);
        }
    }
}

void search_student_by_id() {
    char id[10];
    printf("Please input student ID: ");
    scanf("%s", id);

    printf("ID\tName\tGender\tBirth\tPhone\tEnglish\tMath\tTotal\n");
    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        if (strcmp(student->id, id) == 0) {
            print_student(student);
            return;
        }
    }

    printf("Error: Student not found!\n");
}

void search_student_by_name() {
    char name[MAX_NAME_LEN];
    printf("Please input student name: ");
    scanf("%s", name);

    printf("ID\tName\tGender\tBirth\tPhone\tEnglish\tMath\tTotal\n");
    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        if (strcmp(student->name, name) == 0) {
            print_student(student);
            return;
        }
    }

    printf("Error: Student not found!\n");
}

void sort_students_by_total() {
    for (int i = 0; i < student_count - 1; i++) {
        for (int j = i + 1; j < student_count; j++) {
            if (students[i].total < students[j].total) {
                Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

void delete_student_by_id() {
    char id[10];
    printf("Please input student ID: ");
    scanf("%s", id);

    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        if (strcmp(student->id, id) == 0) {
            for (int j = i + 1; j < student_count; j++) {
                students[j - 1] = students[j];
            }
            student_count--;
            printf("Student %s deleted!\n", id);
            return;
        }
    }

    printf("Error: Student not found!\n");
}

void modify_student_by_id() {
    char id[10];
    printf("Please input student ID: ");
    scanf("%s", id);

    for (int i = 0; i < student_count; i++) {
        Student* student = &students[i];
        if (strcmp(student->id, id) == 0) {
            printf("Please input student name: ");
            scanf("%s", student->name);
            printf("Please input student gender: ");
            scanf("%s", student->gender);
            printf("Please input student birth: ");
            scanf("%s", student->birth);
            printf("Please input student phone: ");
            scanf("%s", student->phone);
            printf("Please input student English score: ");
            scanf("%d", &student->english);
            printf("Please input student math score: ");
            scanf("%d", &student->math);

            student->total = student->english + student->math;

            printf("Student %s modified!\n", id);
            return;
        }
    }

    printf("Error: Student not found!\n");
}

void show_menu() {
    printf("****************************************\n");
    printf("*        Student Information System     *\n");
    printf("****************************************\n");
    printf("* 1. Add student                        *\n");
    printf("* 2. Browse students                    *\n");
    printf("* 3. Calculate total score              *\n");
    printf("* 4. Search student by ID               *\n");
    printf("* 5. Search student by name             *\n");
    printf("* 6. Sort students by total score       *\n");
    printf("* 7. Delete student by ID               *\n");
    printf("* 8. Modify student by ID               *\n");
    printf("* 0. Exit                               *\n");
    printf("****************************************\n");
    printf("Please input your choice: ");
}

int main() {
    if (!load_data("students.txt")) {
        printf("Error: Failed to load student data!\n");
        return 1;
    }

    while (1) {
        show_menu();

        int choice;
        scanf("%d", &choice);

        switch (choice) {
        case 1:
            add_student();
            save_data("students.txt");
            break;
        case 2:
            browse_students();
            break;
        case 3:
            calculate_total();
            break;
        case 4:
            search_student_by_id();
            break;
        case 5:
            search_student_by_name();
            break;
        case 6:
            sort_students_by_total();
            browse_students();
            break;
        case 7:
            delete_student_by_id();
            save_data("students.txt");
            break;
        case 8:
            modify_student_by_id();
            save_data("students.txt");
            break;
        case 0:
            save_data("students.txt");
            return 0;
        default:
            printf("Error: Invalid choice!\n");
            break;
        }
    }

    return 0;
}

上述代码实现了学生信息管理系统的所有功能，包括学生信息录入、浏览、查询、排序、删除和修改等。其中，学生信息使用文件保存，可以实现系统数据的持久化。