C语言程序中数据结构分析：字符计数与空格统计

#include    <stdio.h>  
#include    <string.h>  
#include    <stdlib.h>  
#include    <ctype.h>  
  
#define   MAX_LENGTH   4000 
  
int   ParseString(const   char   *parse_str,   int   *letter_num,   int   *space_num,   int   *total_num, 
                const   char   *stat_str,   int   *str_num); 
  
int   main(int   argc,   char   **argv) 
{ 
    int   letter_num,   space_num,   total_num,   str_num; 
    const   char   *stat_str   =    "abc "; 
    char   input_str[MAX_LENGTH]; 
    char   parse_str[MAX_LENGTH]; 
    FILE   *fd   =   NULL; 
    fd   =   fopen( "data.txt ",    "wb+ ");   //err 
    while   (   1   ) 
    { 
        fgets(input_str,   MAX_LENGTH,   stdin);   //err 
        if   (   *input_str   ==    '# '   ) 
            break; 
        fwrite(input_str,   1,   strlen(input_str)-1,   fd);   //err 
        *input_str   =    '\r '; 
        *(input_str+1)   =    '\n '; 
        fwrite(input_str,   1,   2,   fd);   //err 
    } 
     
    fseek(fd,   0,   SEEK_SET);   //err