Calculate harmonics, geometrics, arithmetics and quadratics average

{ PRIEMERY.PAS              Copyright (c) TrSek alias Zdeno Sekerak }
{ Zistite harmonicky, geometricky, aritmeticky a kvadraticky        }
{ priemer danych n kladnych cisel.                                  }
{                                                                   }
{ Datum:23.05.2004                             http://www.trsek.com }
 
program priemery;
var poc:integer;
    p1,p2,p3,p4: real;
    i:integer;
    x:real;
 
begin
  WriteLn('Vypocitam harmonicky, geometricky, aritmeticky a kvadraticky priemer.');
  Write('Zadaj kolko bude cisel:');
  ReadLn(poc);
 
  { znulujeme }
  p1:=0;
  p2:=1;
  p3:=0;
  p4:=0;
 
  for i:=1 to poc do begin
    Write('x[',i,']=');
    ReadLn(x);
 
    if(x<=0) then
      WriteLn('Iba kladnych cisel');
 
    p1 := p1+(1/x);
    p2 := p2*x;
    p3 := p3+x;
    p4 := p4+(x*x)
  end;
 
  p1 := poc/p1;
  p2 := Exp(ln(p2)/poc);
  p3 := p3/poc;
  p4 := sqrt(p4/poc);
 
  WriteLn('Harmonicky  priemer je:', p1:1:3 );
  WriteLn('Geometrciky priemer je:', p2:1:3 );
  WriteLn('Aritmeticky priemer je:', p3:1:3 );
  WriteLn('Kvadraticky priemer je:', p4:1:3 );
  ReadLn;
end.