帮我把正确的代码完整的写一遍

好的，以下是修改后的完整代码：

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

#define MAX_NAME_LEN 20
#define MAX_COURSE_NUM 10
#define MAX_STUDENT_NUM 100

typedef struct {
    long num;
    char name[MAX_NAME_LEN];
    int score[MAX_COURSE_NUM];
    int total;
    int rank;
} STUDENT;

void ReadFromFile() {
    FILE *fin;
    int i, j, NumOfStudent, NumOfCourse;
    fin = fopen("F:/学生管理/input.txt", "r");
    if (fin == NULL) {
        printf("Failed to open a file!\n");
        exit(0);
    }
    fscanf(fin, "%d%d", &NumOfStudent, &NumOfCourse);
    STUDENT *stu = (STUDENT*) calloc(NumOfStudent, sizeof(STUDENT));
    int *Total = (int*) calloc(NumOfStudent, sizeof(int));
    char buf[1024];
    for (i = 0; i < NumOfStudent; i++) {
        fscanf(fin, "%ld", &stu[i].num);
        fgets(buf, 1024, fin);
        sscanf(buf, "%s", stu[i].name);
        for (j = 0; j < NumOfCourse; j++) {
            fscanf(fin, "%d", &stu[i].score[j]);
            Total[i] += stu[i].score[j];
        }
        stu[i].total = Total[i];
    }
    fclose(fin);
    int k;
    for (i = 0; i < NumOfStudent; i++) {
        k = i;
        for (j = i + 1; j < NumOfStudent; j++) {
            if (Total[j] > Total[k]) {
                k = j;
            }
        }
        if (k != i) {
            int tmp = Total[i];
            Total[i] = Total[k];
            Total[k] = tmp;
            STUDENT tmp_stu = stu[i];
            stu[i] = stu[k];
            stu[k] = tmp_stu;
        }
    }
    for (i = 0; i < NumOfStudent; i++) {
        if (i == 0 || Total[i] != Total[i - 1]) {
            stu[i].rank = i + 1;
        } else {
            stu[i].rank = stu[i - 1].rank;
        }
    }
    printf("学号\t姓名");
    for (i = 1; i <= NumOfCourse; i++) {
        printf("\t课程%d", i);
    }
    printf("\t总分\t排名\n");
    for (i = 0; i < NumOfStudent; i++) {
        printf("%ld\t%s", stu[i].num, stu[i].name);
        for (j = 0; j < NumOfCourse; j++) {
            printf("\t%d", stu[i].score[j]);
        }
        printf("\t%d\t%d\n", stu[i].total, stu[i].rank);
    }
    free(stu);
    free(Total);
}

int main() {
    ReadFromFile();
    return 0;
}

这个代码在读取学生姓名的时候使用了 fgets 函数，并在读取后去掉了换行符；在排序后设置学生排名的时候使用了 if/else 语句来处理并列排名的情况。同时，还添加了一些宏定义来规范代码，使其更易读。