SAS Programs：

data work.profit;  
    infile sales;  
    input Year 1-4 Expenses 6-10 Revenue 12-16;
run;
proc means data=work.profit;
run;
proc print data=work.profit;
run;
proc sort data=work.profit;  
    by year;
run;
Question 1：
How many DATA steps does the program below contain?
A one
B three
C four
大家可以思考下，下面给答案。
Answer 1：
  A Correct---This program contains only one DATA step.
  B Incorrect---This program contains three steps of one type,but they are not DATA steps,every DATA step begains with the keyword DATA.
  C Incorrect---This program contains four steps,but not all of them are DATA steps.Remember,every DATA step begains with the keyword DATA.


Question 2：
How many PROC steps does the program below contain?
  A one
  B two
  C three
思考下，答案来了。。。。
Answer 2:
   A Incorrect---Remember that every PROC step begins with the keyword PROC.
   B  Incorrect---Remember that every PROC step begins with the keyword PROC.
   C Correct---The program contains three PROC steps.