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VIRTUAL1.PAS
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Pascal/Delphi Source File
|
1991-02-04
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3KB
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127 lines
(* Chapter 15 - Program 1 *)
program Virtual_1;
{ ******************** class definitions **********************}
type
Vehicle = object
Wheels : integer;
Weight : real;
constructor Init(In_Wheels : integer; In_Weight : real);
procedure Message;
end;
Car = object(Vehicle)
Passenger_Load : integer;
constructor Init(In_Wheels : integer;
In_Weight : real;
People : integer);
procedure Message;
end;
Truck = Object(Vehicle)
Passenger_Load : integer;
Payload : real;
constructor Init(People : integer;
Max_Load : real;
In_Wheels : integer;
In_Weight : real);
procedure Message;
end;
{ ********************* class implementations ******************** }
constructor Vehicle.Init(In_Wheels : integer; In_Weight : real);
begin
Wheels := In_Wheels;
Weight := In_Weight;
end;
procedure Vehicle.Message;
begin
WriteLn('This message is from the vehicle.');
end;
constructor Car.Init(In_Wheels : integer;
In_Weight : real;
People : integer);
begin
Wheels := In_Wheels;
Weight := In_Weight;
Passenger_Load := People;
end;
procedure Car.Message;
begin
WriteLn('This message is from the car.');
end;
constructor Truck.Init(People : integer;
Max_Load : real;
In_Wheels : integer;
In_Weight : real);
begin
Passenger_Load := People;
Payload := Max_Load;
Wheels := In_Wheels;
Weight := In_Weight;
end;
procedure Truck.Message;
begin
WriteLn('This message is from the truck.');
end;
procedure Output_A_Message(VAR Machine : Vehicle);
begin
Write('This is from Output_A_message; ');
Machine.Message;
end;
{ ************************ main program ************************** }
var Unicycle : Vehicle;
Sedan : Car;
Semi : Truck;
begin
Unicycle.Init(1, 12.0);
Sedan.Init(4, 2100.0, 5);
Semi.Init(1, 25000.0, 18, 5000.0);
WriteLn;
Unicycle.Message;
Sedan.Message;
Semi.Message;
WriteLn;
Output_A_Message(Unicycle);
Output_A_Message(Sedan);
Output_A_Message(Semi);
end.
{ Result of execution
This message is from the vehicle.
This message is from the car.
This message is from the truck.
This is from Output_A_Message; This message is from the vehicle.
This is from Output_A_Message; This message is from the vehicle.
This is from Output_A_Message; This message is from the vehicle.
}