The contents of the raw data file EMPLOYEE are listed below:
--------10-------20-------30
Ruth 39 11
Jose 32 22
Sue 30 33
John 40 44
The following SAS program is submitted:
data test;
infile 'employee';
input employee_name $ 1-4;
if employee_name = 'Ruth' then input idnum 10-11;
else input age 7-8;
run;
Which one of the following values does the variable IDNUM contain when the name of the employee is "Ruth"?
A. 11
B. 22
C. 32
D. . (missing numeric value)


直观上看，'Ruth‘对应的IDNUM就是11呀，为什么是22？数据读取的顺序不也是从左到右读的吗？