Palindrome/de
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Palindrom
Definition:
Ein Palindrom ist eine Zeichenkette, die von vorn und von hinten gelesen dasselbe ergibt.\
= Beispiele =
== Deutsch ==
- aha
- Ebbe
- Elle
- Esse
- Neffen
- Otto
- Rentner
- Uhu
- Die Liebe ist Sieger; rege ist sie bei Leid.
Englisch
- racecar
- A man, a plan, a canal: Panama
- Madam I'm Adam
= Die Funktion IsPalindome = Diese Funktion passt für die ASCII und UTF-8 String-Codierung.\
function IsPalindome(const a_text: string): boolean;
var
i, j :longint;
s1, s2, s3 :string;
begin
s1 := UTF8LowerCase( a_text );
j := length( s1 );
i := 1;
s2 := '';
s3 := '';
while ( i <= j ) do
begin
if s1[i] < #$C0 then // ASCII
begin
if (s1[i] >= #$30) and (s1[i] < #$7B)then
begin
if (s1[i] > #$60) or (s1[i] < #$3A) then
begin
s2 := s1[i] + s2;
s3 := s3 + s1[i];
end;
end;
inc( i );
end
else
begin
begin
if s1[i] < #$E0 then // two byte
begin
if ((s1[i] > #$C2) and ( not
// Armenian punctuation
((s1[i] = #$D5) and ((s1[i+1] >= #$99) and (s1[i+1] < #$A0)))
)) then
begin
s2 := s1[i]+ s1[i+1] + s2;
s3 := s3 + s1[i] + s1[i+1];
end;
inc( i ,2);
end
else
begin
if s1[i] < #$F0 then // three byte
begin
if not (
// General punctuation
(s1[i] = #$E2) and ((s1[i+1]= #$80)
or ((s1[i+1]= #$81) and (s1[i+2]< #$B0)))
) then
begin
s2 := s1[i]+ s1[i+1] + s1[i+2]+ s2;
s3 := s3 + s1[i] + s1[i+1] + s1[i+2];
end;
inc( i ,3);
end
else
begin
s2 := s1[i]+ s1[i+1] + s1[i+2]+ s1[i+3] + s2;
s3 := s3 + s1[i] + s1[i+1] + s1[i+2] + s1[i+3];
inc( i ,4);
end
end;
end;
end;
end;
if s2 <> '' then result := s2=s3 else result := false;
end;From the Free Pascal wiki, page "Palindrome/de", as it stood on 2020-02-23 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.