CHAPTER 10  Pointer Types  So far we have talked about  type~;  that provide for the declaration of  statically allocated variables. A  stafic variable  is one that is declared in  a program and subsequently  denotl~d  by its identifier. It is called static,  because it exists (i.e., memory  i~  allocated for it) during the entire  execution of the block (program, procedure, or function) to which it is  local. A variable may, on the other hand, be created and destroyed  dynamically  during the execution of a block (without any correlation to  the static structure of the progran  i).  Such a variable is consequently  called a  dynamic variable  or an  identified variable.  Identified (dynamic) variables do  not occur in an explicit variable  declaration and cannot be accessed directly by identifiers. Instead they  are created and destroyed by using  Ille  predeclared procedures  New  and  Dispose, and they are identified  I,y  pointer values (which might be  implemented as nothing more than the storage addresses of the newly  allocated variables). Pointer valUt  ~  must be assigned to previously  existing pointer variables having  tl I? appropriate pointer type.  to.A.  Pointer Variables and  Idt~ntified  (Dynamic) Variables 