/* valid for and let */

let
	var a:= 0
	function printint(i: int) =
      let function f(i:int) = if i>0 
    	     then (f(i/10); print(chr(i-i/10*10+ord("0"))))
       in if i<0 then (print("-"); f(-i))
          else if i>0 then f(i)
          else print("0")
      end
in 
	while a < 100 do
		(a := a + 1;
		if a > 41 then break);
	printint(a)
end