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<H1>Section 6: Subprograms</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <A NAME="I2998"></A><A NAME="I2999"></A><A NAME="I3000"></A>A
subprogram is a program unit or intrinsic operation whose execution is
invoked by a subprogram call. There are two forms of subprogram: procedures
and functions. A procedure call is a <FONT FACE="Arial, Helvetica">statement</FONT>;
a function call is an expression and returns a value. The definition
of a subprogram can be given in two parts: a subprogram declaration defining
its interface, and a <FONT FACE="Arial, Helvetica">subprogram_body</FONT>
defining its execution. [Operators and enumeration literals are functions.]
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>1.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>To be honest: </B>A function
call is an expression, but more specifically it is a <FONT FACE="Arial, Helvetica">name</FONT>.
</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3001"></A>A <I>callable entity</I> is
a subprogram or entry (see Section 9). <A NAME="I3002"></A>A callable
entity is invoked by a <I>call</I>; that is, a subprogram call or entry
call. <A NAME="I3003"></A>A <I>callable construct</I> is a construct
that defines the action of a call upon a callable entity: a <FONT FACE="Arial, Helvetica">subprogram_body</FONT>,
<FONT FACE="Arial, Helvetica">entry_body</FONT>, or <FONT FACE="Arial, Helvetica">accept_statement</FONT>.
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Ramification: </B>Note that
``callable entity'' includes predefined operators, enumeration literals,
and abstract subprograms. ``Call'' includes calls of these things. They
do not have callable constructs, since they don't have completions. </FONT></DIV>
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