The function clearerr () in C

Void function clearerr (FILE * stream) in Library C deletes end-of-file and error indicator for the given Stream.

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Declare the function clearerr () in C

Void function clearerr (FILE * stream) in Library C deletes end-of-file and error indicator for the given Stream.

Declare the function clearerr () in C

Here is the declaration for the clearerr () function in C:

 void  clearerr ( FILE  * stream )

Parameters

stream - This is the pointer to a FILE object that identifies the Stream.

Returns the value

This function should fail and not set the external variable errno but in case it detects that its parameters are not a valid stream, it must return -1 and set errno to EBADF.

For example

The following C program illustrates the usage of the clearerr () function in C:

 #include int  main () {  FILE  * fp ; char  c ;  fp  =  fopen ( "baitapc.txt" , "w" );  c  =  fgetc ( fp ); if (  ferror ( fp ) ) {  printf ( "Da xay ra loi trong khi doc baitapc.txtn" ); }  clearerr ( fp ); if (  ferror ( fp ) ) {  printf ( "Da xay ra loi trong khi doc baitapc.txtn" ); }  fclose ( fp ); return ( 0 ); }

Suppose we have a text file named baitapc.txt , which is an empty file. Compiling and running this program will produce the following results. Because we try to read a file that has been opened in write-only mode (write only).