Data step containing ^ operator

[knveraraju91]

Dear,

I saw the below pgm containing "not ^first.rsdtc and ^ last.rsdtc;"   I did not understand why it has 'not' and '^'.  Both meaning same. Please help me understand the logic. Thank you

 data check;
 set rstest;
  by usubjid rsdtc;
  if not ^first.rsdtc and ^ last.rsdtc;
  run; 

[ChrisNZ]

That's just bad programming.

Maybe they meant 

if not ( ^first.rsdtc and ^ last.rsdtc );

which is bad programming too as it's really difficult to read. 

Or maybe they changed the code and forgot to remove something. Who knows?

In any case the program line you mention is that same as

if first.rsdtc and ^ last.rsdtc;