feof() is an I/O function that checks the file position indicator for the EOF of the associated stream. This check end of file indicator is generally set by a previous operation on the stream that reached the End-of-File. This function returns a non zero value if the EOF is reached, otherwise "0" is returned.

    int feof ( FILE * stream );

   #include <stdio.h>
   int main()
    {
      long count = 0;
      FILE * stri = fopen ("getceg.txt", "r");
      if( ferror(stri) ) 
          {
            perror( "Error in File" );
           }
      while (!feof (stri)) 
          {
            fgetc (stri); 
            count++;
          }
      fclose (stri);
      printf  ("Total bytes read in the file: %d\n", count-1);
      return 0;
    }

    Total bytes read in the file: 11

In the above example the "feof()" is used to find the total number of bytes read in a text file. The content of the text file is "ABCA1@@ABNM".