跟crakman做sas base认证试题（10）

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                <p><font size="4">10.The following SAS program is submitted:<br>
<br>
data WORK.RETAIL;<br>
&nbsp;&nbsp;  Cost='$20.000';<br>
&nbsp;&nbsp;  Discount=.10*Cost; <br>
run; <br>
<br>
What is the result?</font></p>
<p><font size="4">&nbsp;&nbsp;&nbsp;&nbsp;  A. The value of the variable Discount in the output data set is 2000.No messages are written to the SAS log.<br>
&nbsp;&nbsp;&nbsp;&nbsp;  B. The value of the variable Discount in the output data set is 2000.A note that conversion has taken place is written to the SAS log.<br>
&nbsp;&nbsp;&nbsp;&nbsp;  C. The value of the variable Discount in the output data set is missing.A note in the SAS log refers to invalid numeric data.<br>
&nbsp;&nbsp;&nbsp;&nbsp;  D. The variable Discount in the output data set is set to zero.No messages are written to the SAS log.</font></p>
<p><font size="4">Answer: C<br>
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<p><font size="4">本题考察是数据格式以及在表达式中的转换机制<br>
DISCOUNT最终为缺失值.，也就是PDV初始值缺失值。<br>
如果程序改成：<br>
data WORK.RETAIL;<br>
&nbsp;&nbsp;  Cost='20.000';<br>
&nbsp;&nbsp;  Discount=.10*Cost;<br>
&nbsp;&nbsp;  Put Discount; <br>
run; <br>
结果由是如何呢？<br>
读者自己运行一下！<br>
结合前几个例子里面的MDY函数。<br>
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