想请教下adv 63题里面第38题  

The following SAS program issubmitted:

     %macro CHECK(Num=4);      

        %let Result=%eval(&Num gt5);   

        %put Result is &result;

     %mend;   

     %check(Num=10)     

  What is written to the SAS log?

        A.

Result is 0   

     B.

Result is 1   

     C.

Result is 10 gt 5      

     D.

Result is true

答案选B

想请问下这道题是拿4还是10去跟5比较呢？具体是得怎么看？

还有就是为什么把4和10位置互换后，答案就变成Result is 0了呢？