56. The following SAS program is submitted:

%let a = cat;

%macro animal (a=frog);

%let a = bird;

%mend;

%animal (a=pig)

%put a is &a；

 

Which one of the following is written to the SAS log?

 

1. a is &a

2. a is cat

3. a is pig

4. a is bird

Correct answer: b

 

Q30. the following SAS program is submitted:

%let a=apple;

%macro fruit;

%let a = orange;

%mend;

%fruit

%put a is &a;

 

Which one of the following is written to the SAS log?

 

1. a is apple

2. a is orange

3. a is &a

4. a is

Correct answer: b

请大家帮我看看这两道题的区别。谢谢。