master/reconstruct/page079.inc

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<!--
        UCSD Pascal System II.0 User Manual
        Copyright (C) 1979 Regents of the University of California

        HTML markup and formatting
        Copyright (C) 2006, 2007, 2010 Peter Miller
-->
<dt>
    <#include reconstruct/page "page079" "79">
<tt>G</tt><dd>
    Affects the boolean variable <tt>GOTOOK</tt> in the compiler.  This
    boolean is used by the compiler to determine whether it should allow
    the use of the Pascal <tt>GOTO</tt> statement within the program.
    <p>
    Default value: <tt>G-</tt>
    <dl><dt><tt>G+</tt><dd>
        allows the use of the GOTO statement.
        <p>
    <dt><tt>G-</tt><dd>
        causes the compiler to generate a syntax error upon
        encountering a <tt>GOTO</tt> statement.
    </dl>
    <p>
    The <tt>G-</tt> option has been used at UCSD to restrict novice
    programmers from excessive uses of the <tt>GOTO</tt> statement in situations
    where more structured constructs such as <tt>FOR</tt>, <tt>WHILE</tt> or
    <tt>REPEAT</tt>
    statements would be more appropriate.
    <p>

<dt><tt>I</tt><dd>
    When an &lsquo;I&rsquo; is followed immediately by a &lsquo;+&rsquo; or
    &lsquo;-&rsquo;, the
    control comment will affect the boolean variable <tt>IOCHECK</tt> within the
    compiler.  An alternative use of &lsquo;I&rsquo; in a compiler control
    comment
    causes the compiler to include a different source file into the
    compilation at that point.  See <b>Include File Mechanism</b>, below,
    for syntax.
    <p>
    <b>Iocheck Option</b>
    <p>
    Default value: I+
    <dl><dt><tt>I+</tt><dd>
        instructs the compiler to generate code after each statement
        which performs any I/O, in order to check to see if the I/O
        operation was accomplished successfully.  In the case of an
        unsuccessful I/O operation the program will be terminated
        with a run time error.
    <dt><tt>I-</tt><dd>
        instructs the compiler not to generate any I/O checking
        code.  In the case of an unsuccessful I/O operation the
        program is not terminated with a run time error.
    </dl>
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