Global variables
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A global variable is a variable 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.