64  Pascal  User  Manual  6.C.  Pack and Unpack  element  (A [ 1) )  to be most signific  IIIlt  and is detennined by the ordering  of the predeclared type Char.  Access to individual components \If packed arrays is often costly, and  depending on the situation and the particular Pascal implementation,  sometimes you are advised to pack or unpack a packed array in a single  operation. This is possible through the predeclared transfer procedures  Pack and Unpack. Letting U be a non-packed array variable of type  and P  be a packed array variable  (If  type  array  [A .. D)  of T  { T  cannot be a t  I )E'  containing a  file type  }  packed array  [B .. C)  of  where ord (D)  - ord (A)  >=  ord ")  - ord (B)  then  Pack  (U,I,P)  means to pack that part of u beginning at component I  into P, and  Unpack  (P,U,I)  means to unpack pinto u beginnillg at component 1. 