求助：SAS BASE PREP GUIDE21章第三题 为什么是C不是B

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如题，很是搞不清楚什么时候用@，什么时候用@@莫非 如果一行对应的只有2个数据就用@ 多于两个就是@@？

还有SAS 70的第二题 请牛人来帮忙解答下吧。。。

另外 怎么么有人写SAS70的解析呢

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关键词：Prep Guide prep guid SAS base Guide Base 求助 SAS Guide Base Prep

Given the following raw data records in TEXTFILE.TXT:

  ----|----10---|----20---|----30
  John,FEB,13,25,14,27,Final
  John,MAR,26,17,29,11,23,Current
  Tina,FEB,15,18,12,13,Final
  Tina,MAR,29,14,19,27,20,Current

The following output is desired:

  Obs  Name  Month  Status    Week1   Week2   Week3   Week4   Week5

   1   John   FEB   Final       $13     $25     $14     $27       .
   2   John   MAR   Current     $26     $17     $29     $11     $23
   3   Tina   FEB   Final       $15     $18     $12     $13       .
   4   Tina   MAR   Current     $29     $14     $19     $27     $20

Which SAS program correctly produces the desired output?

        A.
data WORK.NUMBERS;
   length Name $ 4 Month $ 3 Status $ 7;
   infile 'TEXTFILE.TXT' dsd;
   input Name $ Month $;
   if Month='FEB' then input Week1 Week2 Week3 Week4 Status $;
   else if Month='MAR' then input Week1 Week2 Week3 Week4 Week5 Status $;
   format Week1-Week5 dollar6.;
run;
proc print data=WORK.NUMBERS;
run;

     B.
data WORK.NUMBERS;
   length Name $ 4 Month $ 3 Status $ 7;
   infile 'TEXTFILE.TXT' dlm=',' missover;
   input Name $ Month $;
   if Month='FEB' then input Week1 Week2 Week3 Week4 Status $;
   else if Month='MAR' then input Week1 Week2 Week3 Week4 Week5 Status $;
   format Week1-Week5 dollar6.;
run;
proc print data=WORK.NUMBERS;
run;

     C.
data WORK.NUMBERS;
   length Name $ 4 Month $ 3 Status $ 7;
   infile 'TEXTFILE.TXT' dlm=',';
   input Name $ Month $ @;
   if Month='FEB' then input Week1 Week2 Week3 Week4 Status $;
   else if Month='MAR' then input Week1 Week2 Week3 Week4 Week5 Status $;
   format Week1-Week5 dollar6.;
run;
proc print data=WORK.NUMBERS;
run;

     D.
data WORK.NUMBERS;
   length Name $ 4 Month $ 3 Status $ 7;
   infile 'TEXTFILE.TXT' dsd @;
   input Name $ Month $;
   if Month='FEB' then input Week1 Week2 Week3 Week4 Status $;
   else if Month='MAR' then input Week1 Week2 Week3 Week4 Week5 Status $;
   format Week1-Week5 dollar6.;
run;
proc print data=WORK.NUMBERS;
run;

Answer: C

@在这里表示列停留，程序读完Name $ Month $并不跳转到下一列，故应使用@。仅供参考。

c选项里面的可以使用dsd