Найти произведение элементов, кратных 3 в массиве, заданном датчиком случайных чисел на интервале( -28, 27 размер производной.

//PascalABC.NET
//Версия 3.3, сборка 1634
begin
var a:=ArrRandom(10,-27,26).Println;
write(a.Where(x->x mod 3=0).Aggregate(Real(1),(x,y)->x*y));
end.

function Len(x1,y1, x2, y2:real):real;

begin

   Len := sqrt( sqr(x1 - x2) + sqr(y1 - y2) );

end;

 

var

  x1,x2,x3,x4,x5, y1, y2, y3, y4, y5:real;

begin

   write('x1 = '); readln(x1);

   write('y1 = '); readln(y1);

   write('x2 = '); readln(x2);

   write('y2 = '); readln(y2);

   write('x3 = '); readln(x3);

   write('y3 = '); readln(y3);

   write('x4 = '); readln(x4);

   write('y4 = '); readln(y4);

   write('x5 = '); readln(x5);

   write('y5 = '); readln(y5);

   writeln('P = ', Len(x1,y1,x2,y2) + Len(x2,y2,x3,y3) + Len(x3,y3,x4,y4) + Len(x4,y4,x5,y5) + Len(x5,y5,x1,y1));

end.

 

function Len(x1,y1, x2, y2:real):real;

begin

   Len := sqrt( sqr(x1 - x2) + sqr(y1 - y2) );

end;

 

var

  x1,x2,x3,x4,x5, y1, y2, y3, y4, y5:real;

begin

   write('x1 = '); readln(x1);

   write('y1 = '); readln(y1);

   write('x2 = '); readln(x2);

   write('y2 = '); readln(y2);

   write('x3 = '); readln(x3);

   write('y3 = '); readln(y3);

   write('x4 = '); readln(x4);

   write('y4 = '); readln(y4);

   write('x5 = '); readln(x5);

   write('y5 = '); readln(y5);

   writeln('P = ', Len(x1,y1,x2,y2) + Len(x2,y2,x3,y3) + Len(x3,y3,x4,y4) + Len(x4,y4,x5,y5) + Len(x5,y5,x1,y1));

end.