#include <io.h>
#include <fcntl.h>
#include <sys\stat.h>
int main()
{
int fp;
long file_size;
if ((fp = open(<q>f:abc.txt</q>, O_RDONLY)) == -1)
printf(<q>Error opening the file \n</q>);
else
{
file_size = filelength(file_handle);
printf(<q>The file size in bytes is %ld\n</q>, file_size);
close(fp);
}
return 0;
}

Output:
======
The file size in bytes is: 2048