请教一个关于Do-loop的问题

shiyiming

[b:2f174cx5]In the data set Work.Invest, what would be the stored value for Year?[/b:2f174cx5]     

Data work.invest;
        Do year=1990 to 2004;
        capital+5000;
        capital+(capital*.10);
       end;
run;
a.missing    b.1990   c.2004    d.2005

这个时候year的值是怎么变化的（答案是D）？

Which of the following statements is false regarding the program shown below?
data work.invest;
do year=1990 to 2004;
Capital+5000;
capital+(capital*.10);
output;
end;
run;
a. The OUTPUT statement writes current values to the data set immediately.
b. The stored value for Year is 2005.
c. The OUTPUT statement overrides the automatic output at the end of the DATA step.
d. The DO loop performs 15 iterations.

题干相近增加了output产生了什么样的变化呢？（答案选B）

shiyiming

i run the statements seperately and found that the anwsers are right.
so weird.