How to make "is not?"

[Hasi]

How to make "is not"? :?:

If I have:
...
if i = w; out "i = w"; goto h


if i < w
xxx ;goto w
if i > w
goto w

how to explain
"IS NOT"?
instead of > and <?

That would follow:

If i IS NOT w
goto w
if i = w
goto h

example just to visualize, without function.

can you help me?