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<h3 class="section">7.2 Missing Values in Expressions</h3>
<p>Most numeric operators yield system-missing when given any
system-missing operand. A string operator given any system-missing
operand typically results in the empty string. Exceptions are listed
under particular operator descriptions.
</p>
<p>String user-missing values are not treated specially in expressions.
</p>
<p>User-missing values for numeric variables are always transformed into
the system-missing value, except inside the arguments to the
<code>VALUE</code> and <code>SYSMIS</code> functions.
</p>
<p>The missing-value functions can be used to precisely control how missing
values are treated in expressions. See <a href="Missing-Value-Functions.html#Missing-Value-Functions">Missing Value Functions</a>, for
more details.
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