Task

 verify the version/revision of your currently running (compiler/interpreter/byte-compiler/runtime environment/whatever your language uses) and exit if it is too old.
 check whether the variable "bloop" exists and whether the math-function "abs()" is available and if yes compute abs(bloop).


Extra credit

 Report the number of integer variables in global scope, and their sum.


s" MAX-U" environment? [IF]
   0xffffffff <> [IF] .( Requires 32 bits! ) bye [THEN]
[THEN]
 
[defined] bloop [if]
[defined] abs [if]
  bloop @ abs
[then] [then]