GroundPY/test2.grnd

set &number 4
set &stop 0

fun -double !mod -double &in -double &modulus
    lesser $in $modulus &store
    not $store &store
    if $store %downloop

    lesser $in 0 &store
    if $store %uploop

    jump %end

    @downloop
    subtract $in $modulus &in
    lesser $in $modulus &store
    not $store &store
    if $store %downloop
    jump %end

    @uploop
    add $in $modulus &in
    lesser $in 0 &store
    if $store %uploop
    jump %end

    @end
    return $in
endfun

@loop
equal $number 1 &stop
if $stop %end


jump %loop

@end
end 0