Programming puzzles

[Perakp]

Ok I wanted to ask a little fast question, but realized the question was too stupid to ask. Might aswell find the answer myself since I got the pseudocode written. To make the topic worthwhile, post any small programming puzzles or problems to test one's programming abilities.

 

I'll go first:

 

In Java I have made my own class, that holds one property. It has a method to set that property and another one to print it to the console.

Consider the following code. What would it print?

Object a = new Object();
a.setProperty(5);
ArrayList<Object> list = new ArrayList<Object>();
list.add(a);

list.get(0).setProperty(6);
a.printProperty();
list.get(0).printProperty();

a.setProperty(4);
a.printProperty();
list.get(0).printProperty();

 

Answer:

[hide]

6

6

4

4

[/hide]

[Flyphe]

haha nice, thats cool. Need to remember pointers... ;)

Who else got it right? (I did)

 

There is some good puzzles here, try writing a program that outputs the answer to each question :D

 

http://foohack.com/2008/07/programming-puzzles-and-our-mismatch-problem/