The ferror () function in C

The int ferror function (FILE * stream) in Library C checks the error indicator for the given Stream.

Table of Contents

Declare the function ferror () in C

The int ferror function (FILE * stream) in Library C checks the error indicator for the given Stream.

Declare the function ferror () in C

Below is the declaration for the ferror () function in C:

 int  ferror ( FILE  * stream )

Parameters

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

Returns the value

If the Error Indicator that binds to the Stream is set, the function returns a value other than zero. Otherwise, the function returns 0.

For example

The following C program illustrates the usage of the ferror () 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 opened in write only mode.