procedure main()
   if not(&features == "large integers") then
      stop("large integers not supported")
   i := 100000 + 10000
   write(i)
   i +:= 2 ^ 30
   write(i)
   i +:= i
   write(i)
   i := 100000 * 10000
   write(i)
   i +:= 2 ^ 30
   write(i)
   i *:= i
   write(i)
   i := -100000 - 10000
   write(i)
   i +:= -(2 ^ 30)
   write(i)
   i -:= 2 ^ 30
   write(i)
end