title	clearerr | Microsoft Docs
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clearerr

Resets the error indicator for a stream. A more secure version of this function is available; see clearerr_s.

Syntax

void clearerr(  
   FILE *stream   
);  

Parameters

stream
Pointer to FILE structure.

Remarks

The clearerr function resets the error indicator and end-of-file indicator for stream. Error indicators are not automatically cleared; once the error indicator for a specified stream is set, operations on that stream continue to return an error value until clearerr, fseek, fsetpos, or rewind is called.

If stream is NULL, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue, this function sets errno to EINVAL and returns. For more information on errno and error codes, see errno Constants.

A more secure version of this function is available; see clearerr_s.

Requirements

Routine	Required header
clearerr	<stdio.h>

For additional compatibility information, see Compatibility in the Introduction.

Example

// crt_clearerr.c  
// This program creates an error  
// on the standard input stream, then clears  
// it so that future reads won't fail.  
  
#include <stdio.h>  
  
int main( void )  
{  
   int c;  
   // Create an error by writing to standard input.  
   putc( 'c', stdin );  
   if( ferror( stdin ) )  
   {  
      perror( "Write error" );  
      clearerr( stdin );  
   }  
  
   // See if read causes an error.  
   printf( "Will input cause an error? " );  
   c = getc( stdin );  
   if( ferror( stdin ) )  
   {  
      perror( "Read error" );  
      clearerr( stdin );  
   }  
   else  
      printf( "No read error\n" );  
}  

  
n  
  

  
      nWrite error: No error  
Will input cause an error? n  
No read error  

See Also

Error Handling
Stream I/O
_eof
feof
ferror
perror, _wperror