How to swap two variables

[bollurajkumar]

I have two number variables.
Ab Ac
1 2
5 8
I need below output:
Ab Ac
2 1
8 5
Here I don't want to create new variable.
Thanks in advance.

[Kurt_Bremser]

Try renaming:

proc datasets library=yourlib;
modify yourdata;
rename
  ab=ac
  ac=ab
;
quit;