program CastkaSlovy;
var
r : real;

function Slovy(c: longint) : string;
var
s : string;
i : byte;
w : word;
function Stovky(w : word) : string;
const
JTab : array[0..9] of string[5] = (
'','jeden','dva','tri','ctyri','pet',
'sest','sedm','osm','devet');
DTab : array[10..19] of string[10] = (
'deset','jedenact','dvanact','trinact','ctrnact','patnact',
'sestnact','sedmnact','osmnact','devatenact');
D1Tab : array[2..9] of string[9] = (
'dvacet','tricet','ctyricet','padesat',
'sedesat','sedmdesat','osmdesat','devadesat');
var s: string;
p: word;
begin
s:= '';
if w <> 0 then begin
p:= w div 100;
if p = 1 then s:= 'jedno ' else
if p = 2 then s:= 'dve ' else s:= JTab[p];
case p of
1: s:= s+'sto ';
2: s:= s+'ste ';
3,4: s:= s+'sta ';
5..9: s:= s+'set ';
end;
w:= w mod 100;
case w of
1..9: s:= s+JTab[w];
10..19: s:= s+DTab[w];
20..99: s:= s+D1Tab[w div 10]+' '+JTab[w mod 10];
end;
end;
Stovky:= s;
end;
begin
if c = 0 then begin
Slovy:= 'nula';
Exit
end;
w:= c div 1000000;
if (w mod 100) in [11..19]
then s:= Stovky(w mod 1000)+ ' milionu '
else case w mod 10 of
0: if w > 0 then s:= Stovky(w mod 1000)+' milionu '
else s:= '';
1: s:= Stovky(w mod 1000)+' milion ';
2..4: s:= Stovky(w mod 1000)+' miliony ';
5..9: s:= Stovky(w mod 1000)+' milionu ';
end;
c:= c mod 1000000;
w:= c div 1000;
if (w mod 100) in [11..19]
then s:= s+Stovky(w mod 1000)+ ' tisic '
else case w mod 10 of
0: if w > 0 then s:= s+Stovky(w mod 1000)+' tisic ';
1,5..9: s:= s+Stovky(w mod 1000)+' tisic ';
2..4: s:= s+Stovky(w mod 1000)+' tisice ';
end;
s:= s+Stovky(c mod 1000);
while s[1] = ' ' do Delete(s,1,1);
i:= 1;
repeat
while (i < length(s)) and (s[i] <> ' ') do Inc(i);
if (i < length(s)) and (s[i+1] = ' ') then Delete(s,i,1);
Inc(i);
until i >= length(s);
Slovy:= s;
end;

begin
writeln('Tento program prevadi ciselny na slovni udaj.');
writeln('Prevod konci zadanim zaporne castky');
repeat
write('Zadej castku: '); readln(r);
if r >= 0 then writeln('Castka slovy: ',Slovy(Trunc(r)));
until r < 0;
end.

Maturita.cz - referát (verze pro snadný tisk)
http://www.maturita.cz/referaty/referat.asp?id=1296