完成一个有以下功能的c语言代码（1） 录入每个学生的学号、姓名和各科考试成绩。 （2） 计算每门课程的总分和平均分。 （3） 计算每个学生的总分和平均分。 （4） 按每个学生的总分由高到低排出名次表。 （5） 按学号由小到大排出成绩表。 （6） 按姓名的字典顺序排出成绩表。 （7） 按学号查询学生排名极其考试成绩。 （8） 按姓名查询学生排名极其考试成绩。 （9） 按优秀（90~100）、良好（80~90）、中等（70~80）、及格（60~70）、不及格（0~59）

以下是一个简单的C语言代码实现以上功能，具体实现可能需要根据实际情况进行修改。

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

#define MAX_NUM 100 // 最大学生数
#define MAX_NAME 20 // 最大姓名长度
#define SUBJECT_NUM 3 // 科目数

typedef struct {
    char id[10]; // 学号
    char name[MAX_NAME]; // 姓名
    int score[SUBJECT_NUM]; // 成绩
    int total_score; // 总分
    float avg_score; // 平均分
    int rank; // 排名
} student;

void input_students(student *students, int *num) {
    printf("请输入学生数：");
    scanf("%d", num);
    for (int i = 0; i < *num; i++) {
        printf("请输入学生信息：学号 姓名 成绩1 成绩2 成绩3\n");
        scanf("%s %s %d %d %d", students[i].id, students[i].name, &students[i].score[0], &students[i].score[1], &students[i].score[2]);
        students[i].total_score = students[i].score[0] + students[i].score[1] + students[i].score[2];
        students[i].avg_score = students[i].total_score / 3.0;
    }
}

void calc_subject_scores(student *students, int num, int *subject_total_score, float *subject_avg_score) {
    memset(subject_total_score, 0, sizeof(int) * SUBJECT_NUM);
    for (int i = 0; i < num; i++) {
        for (int j = 0; j < SUBJECT_NUM; j++) {
            subject_total_score[j] += students[i].score[j];
        }
    }
    for (int i = 0; i < SUBJECT_NUM; i++) {
        subject_avg_score[i] = subject_total_score[i] * 1.0 / num;
    }
}

void calc_student_scores(student *students, int num) {
    for (int i = 0; i < num; i++) {
        students[i].total_score = 0;
        for (int j = 0; j < SUBJECT_NUM; j++) {
            students[i].total_score += students[i].score[j];
        }
        students[i].avg_score = students[i].total_score / 3.0;
    }
}

void sort_students(student *students, int num) {
    for (int i = 0; i < num; i++) {
        students[i].rank = 1;
        for (int j = 0; j < num; j++) {
            if (students[j].total_score > students[i].total_score) {
                students[i].rank++;
            }
        }
    }
    for (int i = 0; i < num; i++) {
        for (int j = i + 1; j < num; j++) {
            if (students[i].total_score < students[j].total_score) {
                student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

void sort_students_by_id(student *students, int num) {
    for (int i = 0; i < num; i++) {
        for (int j = i + 1; j < num; j++) {
            if (strcmp(students[i].id, students[j].id) > 0) {
                student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

void sort_students_by_name(student *students, int num) {
    for (int i = 0; i < num; i++) {
        for (int j = i + 1; j < num; j++) {
            if (strcmp(students[i].name, students[j].name) > 0) {
                student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

void print_students(student *students, int num) {
    for (int i = 0; i < num; i++) {
        printf("%s %s %d %d %d %d %f %d\n", students[i].id, students[i].name, students[i].score[0], students[i].score[1], students[i].score[2], students[i].total_score, students[i].avg_score, students[i].rank);
    }
}

void search_student_by_id(student *students, int num, char *id) {
    for (int i = 0; i < num; i++) {
        if (strcmp(students[i].id, id) == 0) {
            printf("%s %s %d %d %d %d %f %d\n", students[i].id, students[i].name, students[i].score[0], students[i].score[1], students[i].score[2], students[i].total_score, students[i].avg_score, students[i].rank);
            return;
        }
    }
    printf("未找到学号为%s的学生\n", id);
}

void search_student_by_name(student *students, int num, char *name) {
    for (int i = 0; i < num; i++) {
        if (strcmp(students[i].name, name) == 0) {
            printf("%s %s %d %d %d %d %f %d\n", students[i].id, students[i].name, students[i].score[0], students[i].score[1], students[i].score[2], students[i].total_score, students[i].avg_score, students[i].rank);
            return;
        }
    }
    printf("未找到姓名为%s的学生\n", name);
}

void print_students_by_score_range(student *students, int num, int min_score, int max_score) {
    for (int i = 0; i < num; i++) {
        if (students[i].total_score >= min_score && students[i].total_score <= max_score) {
            printf("%s %s %d %d %d %d %f %d\n", students[i].id, students[i].name, students[i].score[0], students[i].score[1], students[i].score[2], students[i].total_score, students[i].avg_score, students[i].rank);
        }
    }
}

int main() {
    student students[MAX_NUM];
    int num = 0;
    int subject_total_score[SUBJECT_NUM];
    float subject_avg_score[SUBJECT_NUM];

    input_students(students, &num);
    calc_subject_scores(students, num, subject_total_score, subject_avg_score);
    calc_student_scores(students, num);
    sort_students(students, num);

    printf("按总分排名：\n");
    print_students(students, num);

    sort_students_by_id(students, num);
    printf("按学号排序：\n");
    print_students(students, num);

    sort_students_by_name(students, num);
    printf("按姓名排序：\n");
    print_students(students, num);

    char search_id[10];
    printf("请输入要查询的学生学号：");
    scanf("%s", search_id);
    search_student_by_id(students, num, search_id);

    char search_name[MAX_NAME];
    printf("请输入要查询的学生姓名：");
    scanf("%s", search_name);
    search_student_by_name(students, num, search_name);

    printf("成绩在80-90分之间的学生：\n");
    print_students_by_score_range(students, num, 80, 90);

    return 0;
}