Determine index minimal member in array of number

{ POSTCISE.PAS                                                      }
{ Urci poziciu a hodnotu minimalneho prvku v poli cisel.            }
{                                                                   }
{ Author: Juraj Pupak                                               }
{ Date  : 27.10.2006                           http://www.trsek.com }
 
program PostupnostCisel;
uses crt;
var
  Pole : array [1..20] of integer;
  min_number,temp : integer;
  i,a : integer;
 
begin
  clrscr;
  min_number := 100;
  Randomize;
 
  For i := 1 To 20 Do
    begin
      Pole[i] := Random (100);
      IF Pole[i] < min_number THEN
        begin
          min_number := Pole[i];
        end;
    end;
 
  For a := 1 To 20 Do
    begin
      IF Pole[a] = min_number THEN
        writeln('Min. prvok sa nachadza v poli na indexe ',a);
    end;
 
  writeln('Minimalny prvok pola je ',min_number);
  readln;
end.