Verified answer

var
a,b,c,d,e:integer;

begin
writeln('vvedity chislo ot 11 do 99 ili vvedity 0 dlya generacii sluchainogo chisla');
readln(a);

if a=0 then
begin

randomize;
a:=random(89) + 10
end;
b:=a div 10;
c:=a mod 10;
d:=b+c;
e:=b*c;
writeln('chislo=',a);
writeln('summa cifr chisla ',a,'=',d);
writeln ('proizvedenie cifr chisla ',a,'=',e);
writeln('chislo obrazovanoe perestanovkoi cifr chisla ',a,'=',c,b);
readln;

end.