复位错误标志

[c]代码库

#include <stdio.h> 

int main(void) 
{ 
   FILE *fp; 
   char ch; 

   /* open a file for writing */ 
   fp = fopen("DUMMY.FIL", "w"); 

   /* force an error condition by attempting to read */ 
   ch = fgetc(fp); 
   printf("%c\n",ch); 

   if (ferror(fp)) 
   { 
      /* display an error message */ 
      printf("Error reading from DUMMY.FIL\n"); 

      /* reset the error and EOF indicators */ 
      clearerr(fp); 
   } 

   fclose(fp); 
   return 0; 
}