{"id":394420,"date":"2024-11-20T02:27:40","date_gmt":"2024-11-20T02:27:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-local-variable-has-no-definition-when-it-is-already-defined-in-actions\/"},"modified":"2024-11-20T11:56:50","modified_gmt":"2024-11-20T11:56:50","slug":"why-local-variable-has-no-definition-when-it-is-already-defined-in-actions","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-local-variable-has-no-definition-when-it-is-already-defined-in-actions\/","title":{"rendered":"Why local variable &#8220;has no definition&#8221; when it is already defined in actions?"},"content":{"rendered":"<p>&lt;p&gt;In <code>scade language reference<\/code>, there is an example as following :&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<code><\/code><code>&lt;br&gt;node StateMachine_1(bI1: bool)&amp;nbsp;&lt;br&gt;&amp;nbsp; returns (bO1: bool default = true; iO2: int16 default = 0; bO3: bool default = false)&lt;br&gt;let&lt;br&gt;&amp;nbsp; automaton SM1&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; initial state ST1&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; unless if bI1 resume ST2;&lt;br&gt;&amp;nbsp; &amp;nbsp; sig sig1;&lt;br&gt;&amp;nbsp; &amp;nbsp; var iV1: int16;&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; let&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; iV1 = 10;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; emit &#039;sig1;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; bO1 = &#039;sig1;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; iO2 = iV1 -&gt; pre iO2 + 2;&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; tel&lt;\/p&gt;&lt;p&gt;&amp;nbsp;&lt;\/p&gt;&lt;p&gt;&amp;nbsp; &amp;nbsp; state ST2&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; sig sig1;&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; var bV1: bool; \/\/ err: V1 has no definition&lt;br&gt;&amp;nbsp; &amp;nbsp; until if true do&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; let&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; emit &#039;sig1;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; bV1 = &#039;sig1;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; bO3 = bV1;&amp;nbsp;&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; tel&lt;br&gt;&amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; restart ST1;&amp;nbsp;&lt;br&gt;&amp;nbsp; returns ..;&lt;br&gt;tel&lt;br&gt;<\/code><code><\/code>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;When compile the program using kcg, error &#8220;V1 has no definition&#8221; occurs. But <code>V1<\/code> will be always defined in transition action every time entering state <code>ST2<\/code>. How to understand this error?&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394420","topic","type-topic","status-answered","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"In scade language reference, there is an example as following : node StateMachine_1(bI1: bool) returns (bO1: bool default = true; iO2: int16 default = 0; bO3: bool default = false)let automaton SM1 initial state ST1 unless if bI1 resume ST2; sig sig1; var iV1: int16; let iV1 = 10;\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-local-variable-has-no-definition-when-it-is-already-defined-in-actions\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Why local variable \u201chas no definition\u201d when it is already defined in actions? 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