Local and Global

Local and Global

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Names are active only in certain areas of a program. These areas are defined by the rules of scope (see: Scope). A name that is declared within a procedure is said to be local to that procedure. A name that is defined for several procedures is global to those procedures.

 

A procedure is an independent piece of code that can contain its own declarations. For example:

 

        code Ran=1;

        integer Number;

 

                procedure MakeNumber;

                integer Times, X;       \Local variables

                begin                   \Randomly pick a random number

                Times:= Ran(10);

                for X:= 0, Times do Number:= Ran(100) + 1;

                end;

 

        begin

        MakeNumber;

        end;

 

In this example Times and X are local names while Number, Ran, and MakeNumber are global names.