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2021、02、01：再次发现有问题，各位不妨找一找

多次修改终于可以了，数组清零少了Id、姓、名的清零

#include 
   
    #include 
    
     #include 
     
      #define LEN 19typedef struct{
       int id;          //球员的编号    char fname[LEN]; //球员的名;    char lname[LEN]; //球员的姓;    int stage_num;   //球员的上场次数;    int hit_num;     //球员的击中数;    int base_num;    //球员的走垒数;    int rbi;         //球员的打点;    float hit_rate;  //球员的安打率;} TEAM;void clean_trash(TEAM players[], int n);int read_datas(TEAM players[], int n, FILE *fp);void count_hit_rate(TEAM players[], int n);void show_messages(TEAM players[], int n);int main(void){
       FILE *fp;    int len;    TEAM players[LEN];    if ((fp = fopen("datas.txt", "r")) == NULL)    {
           fprintf(stderr, "Can't open file datas.txt.\n");        exit(EXIT_FAILURE);    }    clean_trash(players, LEN);          //为累计数据之和做准备,清理内存;    len = read_datas(players, LEN, fp); //统计文件中不同球员的数量;    count_hit_rate(players, LEN);    show_messages(players, LEN);    if (fclose(fp) != 0)    {
           fprintf(stderr, "Can't close file datas.txt.\n");        exit(EXIT_FAILURE);    }    return;}void clean_trash(TEAM players[], int n){
       int i;    for (i = 0; i < n; i++) //原数组内容全部清零    {
           players[i].id = 0;        players[i].stage_num = 0;        players[i].hit_num = 0;        players[i].base_num = 0;        players[i].rbi = 0;        memset(players[i].fname, 0 , LEN);        memset(players[i].lname, 0 , LEN);    }}int read_datas(TEAM players[], int n, FILE *fp){
       int ch = 0;    int count = 0;    float hit_rate;    char fname[LEN], lname[LEN];    int m, stage_num, hit_num, base_num, rbi;    //fscanf如果成功，该函数返回成功匹配和赋值的个数。如果到达文件末尾或发生读错误，则返回 EOF。    count = fscanf(fp, "%d %18s %18s %d %d %d %d",                   &m, fname, lname, &stage_num, &hit_num, &base_num, &rbi);    while ((count == 7) && !feof(fp) && (ch < n))    {
           if (players[m].stage_num == 0)//球员上场次数为0，就去访问下一个有效的球员信息数组        {
               ch++;        }        players[m].id = m;        strcpy(players[m].fname, fname); //把文本中的球员信息赋给m这个有效数组里去        strcpy(players[m].lname, lname);        players[m].stage_num += stage_num;        players[m].hit_num += hit_num;        players[m].base_num += base_num;        players[m].rbi += rbi;        //再次读取一下文本数据（有具体内容信息的数组）        count = fscanf(fp, "%d %18s %18s %d %d %d %d",                       &m, fname, lname, &stage_num, &hit_num, &base_num, &rbi);    }    return ch;}void count_hit_rate(TEAM players[], int n){
       int i;    for (i = 0; i < n; i++)    {
           players[i].hit_rate = (float)players[i].hit_num / (float)players[i].stage_num;        //计算每个运动员的安打率;    }    return;}void show_messages(TEAM players[], int n){
       int i;    printf("Datas for all players:\n");    printf("Id   First_name   Last_name   Stage   Hit_rate   Base_num   RBI   Hit_rate\n");    for (i = 0; i < n; i++)    {
           printf("%d %12s %10s %5d %7d %11d %8d %8.2f\n",               players[i].id, players[i].fname, players[i].lname,               players[i].stage_num, players[i].hit_num, players[i].base_num,               players[i].rbi, players[i].hit_rate);    }    return;}
     
    
   

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