#include
int main ()
{
FILE *file;
long size;
file = fopen ("my.txt","rb");
if (file == NULL)
perror ("Error reading my.txt.");
else {
fseek (file, 0, SEEK_END);
size = ftell(file);
fclose (file);
printf ("Size of my.txt is %ld bytes.\n",size);
}
return 0;
}