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Andrew Branscom http://wiki.sierrahelp.com/index.php?title=Subn&diff=89093&oldid=prev 2019-04-24T02:44:48Z

<p>Created page with &quot;The &#039;&#039;&#039;subn&#039;&#039;&#039; command subtracts a numerical value from a variable. == Syntax == subn(<a href="/index.php/Variable" title="Variable">var</a> vA, <a href="/index.php/Number" title="Number">byt</a> B);&lt;br /&gt; vA = vA - B;&lt;br /&gt; vA -= B;&lt;br /&gt; == Rem...&quot;</p> <p><b>New page</b></p><div>The &#039;&#039;&#039;subn&#039;&#039;&#039; command subtracts a numerical value from a variable.<br /> <br /> == Syntax ==<br /> <br /> subn([[variable|var]] vA, [[number|byt]] B);&lt;br /&gt;<br /> vA = vA - B;&lt;br /&gt;<br /> vA -= B;&lt;br /&gt;<br /> <br /> == Remarks ==<br /> <br /> Because [[variable]]s are 8 bit unsigned numbers, if the result of the subtraction is less than 0, the result &#039;wraps around&#039;. For example, if v50 currently equals<br /> 20, the statement:<br /> <br /> &lt;CODE&gt;subn(v50, 25);&lt;/code&gt;<br /> <br /> will result in a value for v50 of 251 (20 - 25 = -5; -5 + 256 = 251).<br /> <br /> If the value of &#039;&#039;&#039;B&#039;&#039;&#039; is 1, WinAGI will use the &#039;&#039;&#039;[[decrement]]&#039;&#039;&#039; command instead of &#039;&#039;&#039;subn&#039;&#039;&#039; if you use the alternate syntax (i.e. &#039;&#039;&#039;vA&#039;&#039;&#039; = &#039;&#039;&#039;vA&#039;&#039;&#039; - 1 or &#039;&#039;&#039;vA&#039;&#039;&#039; -= 1). To force the compiler to use &#039;&#039;&#039;subn&#039;&#039;&#039;, use the full form: subn(&#039;&#039;&#039;vA&#039;&#039;&#039;, 1). This important because the &#039;&#039;&#039;decrement&#039;&#039;&#039; command does not wrap around like the &#039;&#039;&#039;subn&#039;&#039;&#039; command.<br /> <br /> == Possible Errors ==<br /> <br /> None.<br /> <br /> == Example ==<br /> <br /> &lt;div class=&quot;CodeBlockHeader&quot;&gt;Code:&lt;/div&gt;<br /> &lt;syntaxhighlight lang=&quot;agi&quot;&gt;<br /> v50 = 40;<br /> subn(v50, 25); [ v50 now equals 15<br /> v50 = v50 - 25; [ v50 now equals 246 (-10 + 256)<br /> v50 -= 25; [ v50 now equals 221<br /> &lt;/syntaxhighlight&gt;<br /> <br /> == Technical Information ==<br /> <br /> {| border=&quot;1&quot; cellpadding=&quot;2&quot;<br /> | style=&quot;background-color: #efefef&quot; width=&quot;200&quot; | &#039;&#039;&#039;Required Interpreter Version:&#039;&#039;&#039;<br /> | width=&quot;175&quot; | Available in all AGI versions.<br /> |-<br /> | style=&quot;background-color: #efefef&quot; | &#039;&#039;&#039;Byte-Code Value:&#039;&#039;&#039;<br /> | 7 (0x07 hex)<br /> |}<br /> <br /> == See Also ==<br /> <br /> [[Mathematical Commands]]&lt;br /&gt;<br /> &#039;&#039;&#039;[[subv]]&#039;&#039;&#039;&lt;br /&gt;<br /> &#039;&#039;&#039;[[decrement]]&#039;&#039;&#039;&lt;br /&gt;<br /> [[Category:Commands]]&lt;br /&gt;</div>

en>Andrew Korson