C语言代码由键盘任意输入5个学生的姓名、学号、以及每一个学生的4门功课的成绩，分别计算他们的总分和均分，并将此表按总分的高低排序。

好的，让我来回答你的问题。这道题目的解决方法如下：

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

#define NAME_LEN 20
#define MAX_STUDENT_NUM 5
#define COURSE_NUM 4

// 学生信息的结构体
typedef struct {
    char name[NAME_LEN];         // 名字
    char id[NAME_LEN];           // 学号
    int scores[COURSE_NUM];      // 成绩
    int total;                   // 总分
    float avg;                   // 平均分
} student_t;

int main() {
    student_t students[MAX_STUDENT_NUM];
    int i, j;

    // 读入学生信息
    for (i = 0; i < MAX_STUDENT_NUM; i++) {
        printf("请输入第%d个学生的姓名，学号，以及每门课的成绩：\n", i+1);
        scanf("%s%s", students[i].name, students[i].id);
        students[i].total = 0;
        for (j = 0; j < COURSE_NUM; j++) {
            scanf("%d", &students[i].scores[j]);
            students[i].total += students[i].scores[j];
        }
        students[i].avg = (float)students[i].total / COURSE_NUM;
    }

    // 按总分高低进行排序
    student_t temp;
    for (i = 0; i < MAX_STUDENT_NUM - 1; i++) {
        for (j = i + 1; j < MAX_STUDENT_NUM; j++) {
            if (students[i].total < students[j].total) {
                memcpy(&temp, &students[i], sizeof(student_t));
                memcpy(&students[i], &students[j], sizeof(student_t));
                memcpy(&students[j], &temp, sizeof(student_t));
            }
        }
    }

    // 输出学生信息和成绩
    printf("按总分高低排序后的学生信息和成绩如下：\n");
    printf("%-10s%-10s%-10s%-10s%-10s%-10s\n", "姓名", "学号", "成绩1", "成绩2", "成绩3", "成绩4");
    for (i = 0; i < MAX_STUDENT_NUM; i++) {
        printf("%-10s%-10s%-10d%-10d%-10d%-10d\n", students[i].name, students[i].id,
               students[i].scores[0], students[i].scores[1], students[i].scores[2], students[i].scores[3]);
    }
    printf("\n");
    printf("%-10s%-10s%-10s%-10s\n", "姓名", "总分", "平均分", "排名");
    for (i = 0; i < MAX_STUDENT_NUM; i++) {
        printf("%-10s%-10d%-10.2f%-10d\n", students[i].name, students[i].total, students[i].avg, i+1);
    }

    return 0;
}

希望这个程序能够解决你的问题！