Code:
<font color="#000000">X = <font color="#FF0000"><b>0
</b></font><font color="#000080"><b>WHILE </b></font>X &lt; <font color="#FF0000"><b>50
 </b></font><font color="#000080"><b>GOSUB </b></font>GoForward
 X = X + <font color="#FF0000"><b>1
</b></font><font color="#000080"><b>WEND

GOSUB </b></font>SubStop  <font color="#000080"><i>' Stop is reserved word, use something else; like SubStop.
</i></font>