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<P LANG="en-US" CLASS="western" STYLE="margin-bottom: 0.49cm; line-height: 100%">
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<FONT FACE="Times New Roman, serif"><FONT SIZE=6><B>10 Declaring
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constants</B></FONT></FONT></P>
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<P CLASS="western" STYLE="margin-top: 0.49cm; margin-bottom: 0.35cm; line-height: 100%; page-break-after: avoid">
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<FONT FACE="Times New Roman, serif"><SPAN LANG="en-US"><FONT SIZE=3 STYLE="font-size: 13pt">TTCN-3
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constants are run-time constants. After value assignment, they do not
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change their value during test execution. They can be used on
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the right hand side of assignments, in expressions, in
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actual parameters, and in template definitions. Constants used within
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type definitions have to have values known at compile-time.</FONT></SPAN></FONT></P>
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<P CLASS="western" STYLE="margin-top: 0.49cm; margin-bottom: 0cm; line-height: 0.35cm">
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<BR>
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</P>
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<P LANG="en-US" CLASS="western" STYLE="margin-top: 0.49cm; margin-bottom: 0.35cm; line-height: 100%">
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<FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><I><B>Semantic
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Description</B></I></FONT></FONT></P>
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<P CLASS="western" STYLE="margin-top: 0.49cm; margin-bottom: 0.35cm; line-height: 100%"><A NAME="6bad5fd1-f781-4575-9bf7-7d072192b195"></A><A NAME="46a823b1-6b23-422e-8806-9aa7d48db19d"></A><A NAME="c15669fb-0f00-45db-adbb-3fb15aaca0a9"></A><A NAME="1763e6bf-c0ab-43e8-b849-fcc56bfa9918"></A>
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<FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">A
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constant assigns a name to a fixed value.</SPAN></FONT></FONT></FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">A
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value is assigned only once to a constant, at the place of its
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declaration.</SPAN></FONT></FONT></FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">The
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constant does not change its value during test execution.</SPAN></FONT></FONT></FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">The
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constant is defined only once, but can be referenced multiple times
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in a TTCN-3 module.</SPAN></FONT></FONT></FONT></P>
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<P CLASS="western" STYLE="margin-top: 0.49cm; margin-bottom: 0.35cm; line-height: 100%">
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<FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">Optional
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fields of record and set constants or constant fields can be
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initialized explicitly or implicitly. For implicit initialization of
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the optional fields of a constant or a constant field,
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an </SPAN></FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US"><B>optional</B></SPAN></FONT></FONT></FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">attribute
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with the value </SPAN></FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US"><B>"implicit
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omit"</B></SPAN></FONT></FONT></FONT><FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Times New Roman, serif"><FONT SIZE=3 STYLE="font-size: 13pt"><SPAN LANG="en-US">(see
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clause Ошибка: источник перекрестной ссылки не найден) shall be
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associated with it either directly or via the attribute distribution
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(scoping) mechanism (see clause Ошибка: источник перекрестной ссылки
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не найден).</SPAN></FONT></FONT></FONT></P>
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