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uses
  crt;
type
  TVector=object
            private
              x,y:real;
            public
              procedure Init(x1,x2,y1,y2:real);
              procedure SetVector(valueX,valueY:real);
              procedure GetVector(var valueX:real;var valueY:real);
              function length:real;
          end;
  TOperation=object
               private
                 vector1,vector2:TVector;
               public
                 procedure SetVectors(valueVector1,valueVector2:TVector);
             end;
  TOperationAdd=object(TOperation)
                  procedure Add(valueVector1,valueVector2:TVector;var result:TVector);
                end;
  TOperationSub=object(TOperation)
                  procedure Sub(valueVector1,valueVector2:TVector;var result:TVector);
                end;
  TOperationMulScalyar=object(TOperation)
                         function MulScalyar(valueVector1,valueVector2:TVector):real;
                       end;
  TOperationMulVector=object(TOperation)
                        function MulVector(valueVector1,valueVector2:TVector):real;
                      end;
procedure TVector.Init(x1,x2,y1,y2:real);
  begin
    x:=x2-x1;
    y:=y2-y1;
  end;
procedure TVector.SetVector(valueX,valueY:real);
  begin
    x:=valueX;
    y:=valueY;
  end;
procedure TVector.GetVector(var valueX:real;var valueY:real);
  begin
    valueX:=x;
    valueY:=y;
  end;
function TVector.length:real;
  begin
    length:=sqrt(sqr(x)+sqr(y));
  end;
procedure TOperation.SetVectors(valueVector1,valueVector2:TVector);
  begin
    vector1:=valueVector1;
    vector2:=valueVector2;
  end;
procedure TOperationAdd.Add(valueVector1,valueVector2:TVector;var result:TVector);
  var
    vectorX1,vectorX2,vectorY1,vectorY2:real;
  begin
    inherited SetVectors(valueVector1,valueVector2);
    vector1.GetVector(vectorX1,VectorY1);
    vector2.GetVector(vectorX2,VectorY2);
    result.SetVector(vectorX1+vectorX2,vectorY1+vectorY2);
  end;
procedure TOperationSub.Sub(valueVector1,valueVector2:TVector;var result:TVector);
  var
    vectorX1,vectorX2,vectorY1,vectorY2:real;
  begin
    inherited SetVectors(valueVector1,valueVector2);
    vector1.GetVector(vectorX1,VectorY1);
    vector2.GetVector(vectorX2,VectorY2);
    result.SetVector(vectorX2-vectorX1,vectorY2-vectorY1);
  end;
function TOperationMulScalyar.MulScalyar(valueVector1,valueVector2:TVector):real;
  var
    vectorX1,vectorX2,vectorY1,vectorY2:real;
  begin
    inherited SetVectors(valueVector1,valueVector2);
    vector1.GetVector(vectorX1,VectorX2);
    vector2.GetVector(vectorX2,VectorY2);
    MulScalyar:=vectorX1*vectorX2+vectorY1*vectorY2;
  end;
function TOperationMulVector.MulVector(valueVector1,valueVector2:TVector):real;
  var
    scalar,valueCos:real;
    MulScalyar     :TOperationMulScalyar;
  begin
    inherited SetVectors(valueVector1,valueVector2);
    scalar:=MulScalyar.MulScalyar(vector1,vector2);
    valueCos:=scalar/(vector1.length*vector2.length);
    MulVector:=2*scalar*valueCos;
  end;
var
  x,y,x1,x2,y1,y2       :real;
  vector1,vector2,result:TVector;
  operationAdd          :TOperationAdd;
  operationSub          :TOperationSub;
  operationMulScalyar   :TOperationMulScalyar;
  operationMulVector    :TOperationMulVector;
  mulScalyar,mulVector  :real;
begin
  clrscr;
  randomize;
  x1:=random(10);
  x2:=random(10);
  y1:=random(10);
  y2:=random(10);
  vector1.Init(x1,x2,y1,y2);
  vector1.GetVector(x,y);
  writeln('A(',x1:1:0,',',y1:1:0,'); B(',x2:1:0,',',y2:1:0,'); AB(',x:1:0,',',y:1:0,')');
  x1:=random(10);
  x2:=random(10);
  y1:=random(10);
  y2:=random(10);
  vector2.Init(x1,x2,y1,y2);
  vector2.GetVector(x,y);
  writeln('C(',x1:1:0,',',y1:1:0,'); D(',x2:1:0,',',y2:1:0,'); CD(',x:1:0,',',y:1:0,')');
  operationAdd.Add(vector1,vector2,result);
  result.GetVector(x,y);
  writeln('Add: (',x:2:0,',',y:2:0,')');
  operationSub.Sub(vector1,vector2,result);
  result.GetVector(x,y);
  writeln('Sub: (',x:2:0,',',y:2:0,')');
  MulScalyar:=operationMulScalyar.MulScalyar(vector1,vector2);
  writeln('Mul. Scalyar: ',mulScalyar:5:2);
  MulVector:=operationMulVector.MulVector(vector1,vector2);
  writeln('Mul. Vector: ',mulVector:5:2);
  readkey;
end.