Programming quiz
Now ... I found something very interesting I never stumbled upon till now.
(for a reason)
Write a program which swaps the values of 2 integer variables, without using a 3rd varialbe.
In perl of course is super easy :
($a,$b) = ($b, $a);
What are we looking for tough is writing a solution in an inferior language with no superb syntax trickery :)
I'm not gonna post the solution, but will keep an eye on the comments, feel free to be first to solve it.
Marin
3 comments
16.03.2010 Author: Daniel Freeman
The solution I hinted at (exclusive-or, cryptic...encryption), uses the exclusive or operator ^
a = a ^ b;
b = b ^ a;
a = a ^ b;
a = a ^ b;
b = b ^ a;
a = a ^ b;
12.03.2010 Author: Marin
no takers though :)
here 1 solution for vars $a and $b.
$a = $a+$b;
$b = $a-$b;
$a = $a-$b;
there ya go :)
here 1 solution for vars $a and $b.
$a = $a+$b;
$b = $a-$b;
$a = $a-$b;
there ya go :)
09.03.2010 Author: Daniel Freeman
It will take a clever programmer to crack this one. Someone exclusive or crypic perhaps ;)
Posted in Software on 05.Mar 2010
