Global variables

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A global Variable is a variabe that is declared in the main section of a program or the interface part of a unit. Globals declared in a program cannot be accessed from within a unit. Globals declared in a unit can be accessed from within a program or another unit.

 program GlobalVariables;
 var
   g: integer;
 begin
 end.

g is a global variable.

External variable

External variable is a global variable has been declared in unit interface section.

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• Var
• Local_variables