Var

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Var is a keyword used to mark the section where variables and their data types are declared. When used for a parameter of a procedure or function then var indicates the use of a variable parameter.

Variables are typically declared at the beginning of a program, procedure, function or unit.

var
  age: integer;

If you are planning to use various variables of the same type, they can be grouped so they share the same type definition. The variables must be separated by a comma.

var
  FirstName, LastName, address: string;

A var variable as a procedure or function parameter can bet used for a returnvalue:

procedure foo( var v1: sometype; out v2: sometype; const v3: sometype )
begin
  v1 := v1 + v3; // input and return vlaue
  v2 := v3; // only return value
  v3 := myconst; // immutable... only input
end;

See also

• Local variables
• Global variables
• Variable declaration
• Thread Variables