跟crakman做sas base认证试题（32）

shiyiming

From crackman's blog on Baidu


               
                <p><font size="4">32.Consider the following data step:<br>
<br>
data WORK.NEW; <br>
&nbsp;&nbsp;&nbsp;  set WORK.OLD;<br>
&nbsp;&nbsp;&nbsp;  Count+1;<br>
run; <br>
<br>
The variable Count is created using a sum statement. Which statement regarding this variable is true? <br>
&nbsp;&nbsp;&nbsp;&nbsp;  A. It is assigned a value 0 when the data step begins execution.<br>
&nbsp;&nbsp;&nbsp;&nbsp;  B. It is assigned a value of missing when the data step begins execution.<br>
&nbsp;&nbsp;&nbsp;&nbsp;  C. It is assigned a value 0 at compile time. <br>
&nbsp;&nbsp;&nbsp;&nbsp;  D. It is assigned a value of missing at compile time.</font></p>
<p><font size="4">Answer: C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  </font></p>
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<p><font size="4">这道题考察的是SAS表达式。<br>
COUNT+1等价于<br>
RETAIN COUNT 0;<br>
COUNT=COUNT+1;</font></p>
<p><font size="4">至于是不是编译错误，看下面的文章：</font></p>
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