统计文件行数_单词数_字符数

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

/*
统计文件内容行数、单词数、字符数
格式：可执行文件名 -l -w -c 数据文件列表
*/
int main(int argc, char* argv[])
{
   FILE* fp;
   int lflag, wflag, cflag;  //l w c 3个标志
   int line, word;  //行内与单词内标志
   int lcount, wcount, ccount;  //统计变量
   char *s;
   int c;

   if (argc < 2)   //参数个数不够
   {
      printf ("argc error\n");
      exit(1);
   }

   lflag = wflag = cflag = 0;
   lcount = wcount = ccount = 0;

   while (--argc >= 1 && (*++argv)[0] == '-')  //解析参数
   {
      for (s = argv[0] + 1; *s; ++s)
      {
         switch (*s)
         {
            case 'l':         //-l参数
               lflag = 1;
               break;
            case 'w':        //-w参数
               wflag = 1;
               break;
            case 'c':        //-c参数
               cflag = 1;
               break;
            default:         //参数不对
               printf ("To run this program, usage: program -l -w -c file1 file2 ... filen\n");
               exit(1);
         }
      }
   }

   if (argc == 0)   //参数列表中没有数据文件
   {
      printf ("To run this program, usage: program -l -w -c file1 file2 ... filen\n");
      exit(1);
   }

   if (lflag == 0 && wflag == 0 && cflag == 0)  //默认情况下，统计行数、单词数、字符数
      lflag = wflag = cflag = 1;

   while (--argc >= 0)
   {
      if ((fp = fopen(*argv, "r")) == NULL)
      {
         fprintf (stderr, "Can't open %s file\n", *argv);  //在标准错误流下打印出错信息
         continue;
      }

      line = word = 0;   //初始化标志
      while ((c = fgetc(fp)) != EOF)  //逐个字符读取，统计行数或单词数或字符数
      {
         if (cflag)
            ++ccount;
         if (wflag)
         {
            if (c == '\n' || c == ' ' || c == '\t')
               word = 0;
            else if (word == 0)
            {
               ++wcount;
               word = 1;
            }
         }
         if (lflag)
         {
            if (c == '\n')
               line = 0;
            else if (line == 0)
            {
               ++lcount;
               line = 1;
            }
         }
      }

      if (lflag)
         printf ("%s file Lines = %d\n", *argv, lcount);
      if (wflag)
         printf ("%s file Words = %d\n", *argv, wcount);
      if (cflag)
         printf ("%s file Chars = %d\n", *argv, ccount);

      fclose(fp);

      ++argv;  //统计下一个数据文件
      lcount = wcount = ccount = 0;
   }

   system("PAUSE");
   return 0;
}