Swap variables

[MacWomble]

I understand your point not to give useful or easy understandable  answers for such homework questions.
But I think its false to give complicated answers.
Instead you should try to help - this is the sense of the forum. Must not be a solution but some hints should always be useful.
Such like:
"You have to  use a third variable to change the content of two variables"

Your answers (not Thaddys) are not useful for a beginner. Help them to get them with Lazarus !!! 
You all had a time where you began coding ! 

All other answers are coming from (maybe genious) apes I think....

[mangakissa]

I agreed to Macwomble, but the person, who started the topic, can still show some code to he what he has done. And also an example is usefull to see what the person wants.

[Thaddy]

Anyway, I suggest to just remove the thread?

Why? I think my answers are for the most part well written and explanatory.
Non-computable thingies do not come around too often... and this is a prime example explaining the necessity of input fields.
It is part of the fun!

(Note prefix covers "de" sort order is on name, not prefix, but you know that)

[neuro]

Kaslauskaite (daughter of Kaslauskas) (I can complicate that even much further: *ciute instead if *Kaite depending on name)

Surnames are incorrectly written. The same sentence with corrected surnames:
Kazlauskaitė (daughter of Kazlauskas) (I can complicate that even much further: *čiūtė instead if *kaitė depending on name)

By the way, official information from Lithuanian authorities (State Enterprise Centre of Registers):
The most popular surname in the country is Kazlauskaitė - there are almost 5.2 thousand of them in Lithuania.

https://www.registrucentras.lt/naujienos/index.php?mod=news&act=view&id=42565
Pati populiariausia pavardė šalyje yra Kazlauskaitė - jų visoje Lietuvoje galima sutikti beveik 5,2 tūkstančio.

https://www.registrucentras.lt/en/
State Enterprise Centre of Registers (SECR) is a public entity of limited civil liability incorporated by the Government of the Republic of Lithuania on the basis of the State-owned property on 8 July 1997.

[dbannon]

Is your son really called "drop table"?

Just in case someone missed Thaddy's reference, https://xkcd.com/327/

[Thaddy]

Surnames are incorrectly written.

No. I wrote them correctly, (except for the hyphens ) my wife checked it,  Kaslauskiene, meaning: is married to, my mother in law, was the wife of Count Kaslauskas - the last one - . Kaslauskaite means daughter of Kaslauskas like my wife and her sister. It can be even more complex: my stepdaughter is called Benediktaviciute, the daughter of Benediktus... Lithuanian is beautiful. Really fun to learn, but it helps if you have an old school background like Latin. It is nice to see Lithuanian on this forum...

To the point:

Code: Pascal  [Select][+][-]

1. program swapme;
2. { swap without temp variable }
3. {$mode objfpc}{$H+}
4. var
5.   a:integer = 10;
6.   b:integer = 3;
7. begin
8.   writeln(a:4,b:4);
9.   a:=a+b;
10.   b:=a-b;
11.   a:=a-b;
12.   writeln(a:4,b:4);
13. end.