在下面这道题里：
Which INPUT statement reads the values for Lname, Fname, Department and Salary (in that order)?
1---+----10---+----20---
ABRAMS THOMAS
SALES $25,209.03
BARCLAY ROBERT
MARKETING $29,180.36
COURTNEY MARK
PUBLICATIONS $24,006.16

a.	input #1 Lname $ Fname $ /       Department $12. Salary comma10.;
b.	input #1 Lname $ Fname $ /       Department : $12. Salary : comma.;
c.	input #1 Lname $ Fname $       #2 Department : $12. Salary : comma.;
d.	both b and c

Correct answer:  d

为什么在输入Department和Salary，要在format前加冒号 : $12. / : comma.

而下面这个程序，在输入price时，用format comman6.就不用冒号呢？
1---+----10---+----20---
SKIRT BLACK
COTTON
036499 $44.98
SKIRT NAVY
LINEN
036899 $51.50
DRESS RED
SILK
037299 $76.98

data spring.sportswr;

infile newitems;

input #1 Item $ Color $
#3 @8 Price comma6.
#2 Fabric $
#3 SKU $ 1-6;
run;

谢谢！