well "cel" is declared integer. Try with float.
#include <stdio.h>
main()
{
int fh;
float cel;
fh = 200;
cel = 5.0 * (fh-32) / 9.0;
printf("your celsius degree is %lf\n", cel);
}
seems to be working fine
http://www.compileonline.com/compile_c_online.php