呵呵~大家好，两题关于if语句。。。。程序几乎一样。。。但是，第一题有"if...then".....第二题，仅有if...没有then...
第一题中， input style $ @;if style = 'CONDO' or style = 'RANCH' then
input sqfeet bedrooms baths street $ price : dollar10.;无论 style是否是 'Condo'或者 ‘Ranch’, 程序都会 读入 所有 关于 style的数据 ，因此 ，raw data中有几个 observation, 结果 中 就应该有几个 结果。 这样理解应该是正确的吧。


第二题中 ，input style $ @;
if style = 'CONDO' or style = 'RANCH';
input sqfeet bedrooms baths street $ price : dollar10.;
run;
input仍然在 if style = 'Condo' or style = 'Ranch'的前面，也应该是所有的observation都输入的啊，为什么答案是只输入了符合if条件的几个呢。。。。。请各位高手解释啊 ~~~



QUESTION 13
A raw data file is listed below:
RANCH,1250,2,1,Sheppard Avenue,"$64,000"
SPLIT,1190,1,1,Rand Street,"$65,850"
CONDO,1400,2,1.5,Market Street,"80,050"
TWOSTORY,1810,4,3,Garris Street,"$107,250"
RANCH,1500,3,3,Kemble Avenue,"$86,650"
SPLIT,1615,4,3,West Drive,"94,450"
SPLIT,1305,3,1.5,Graham Avenue,"$73,650"
The following SAS program is submitted using the raw data file as input:
data work.condo_ranch;
infile'file-specification' dsd;
input style $ @;
if style = 'CONDO' or style = 'RANCH' then
input sqfeet bedrooms baths street $ price : dollar10.;
run;
How many observations does the WORK.CONDO_RANCH data set contain?
A. 0
B. 3
C. 5
D. 7



A raw data file is listed below:
RANCH,1250,2,1,Sheppard Avenue,"$64,000"
SPLIT,1190,1,1,Rand Street,"$65,850"
CONDO,1400,2,1.5,Market Street,"80,050"
TWOSTORY,1810,4,3,Garris Street,"$107,250"
RANCH,1500,3,3,Kemble Avenue,"$86,650"
SPLIT,1615,4,3,West Drive,"94,450"
SPLIT,1305,3,1.5,Graham Avenue,"$73,650"
The following SAS program is submitted using the raw data file as input:
data work.condo_ranch;

infile'file-specification' dsd;
input style $ @;
if style = 'CONDO' or style = 'RANCH';
input sqfeet bedrooms baths street $ price : dollar10.;
run;
How many observations will the output data set contain?
A. 0
B. 3
C. 5
D. 7
Answer: B