/*--------------------------

     count.c -- 使用标准 I/O

 --------------------------*/

 #include <stdio.h>

 #include <stdlib.h>        //提供 exit() 函数原型

 int main(int argc, char *argv[])

 {

     int ch;        //读取文件时，储存每个字符的地方

     FILE *fp;    //文件指针

     unsigned long count = ;

     if (argc != )

     {

         printf("Usage: %s filename\n", argv[]);

         exit(EXIT_FAILURE);

     }

     if (NULL == (fp = fopen(argv[], "r")))

     {

         printf("Can't open %s\n", argv[]);

         exit(EXIT_FAILURE);

     }

     while (EOF != (ch = getc(fp)))

     {

         putc(ch, stdout);        //同 putchar(ch)

         ++count;

     }

     fclose(fp);

     printf("File %s has %lu characters\n", argv[], count);

     return ;

 }