clearerr Function

Resets the error indicator for the stream.

Include

<stdio.h>

Prototype

void clearerr(FILE *stream);

Argument

Remarks

The function clears the end-of-file and error indicators for the given stream (i.e., feof and ferror will return false after the function clearerr is called).

Example

/* This program tries to write to a file that is */
/* readonly. This causes the error indicator to  */
/* be set.  The function ferror is used to check */
/* the error indicator. The function clearerr is */
/* used to reset the error indicator so the next */
/* time ferror is called it will not report an   */
/* error.                                        */
#include <stdio.h> /* for ferror, clearerr,  */
                   /* printf, fprintf, fopen,*/
                   /* fclose, FILE, NULL     */
int main(void)
{
  FILE *myfile;

  if ((myfile = fopen("sampclearerr.c", "r")) ==
       NULL)
    printf("Cannot open file\n");
  else
  {
    fprintf(myfile, "Write this line to the "
            "file.\n");
    if (ferror(myfile))
      printf("Error\n");
    else
      printf("No error\n");
    clearerr(myfile);
    if (ferror(myfile))
      printf("Still has Error\n");
    else
      printf("Error indicator reset\n");

    fclose(myfile);
  }
}

Example Output

Error
Error indicator reset