Advanced: Calculate square root with templates

**okinrus** · 09-22-2004

I'm going to send you an improved version.

**LuckY** · 09-23-2004

Please post in this thread if you're participating!

I am participating. I emailed you my submission, sangdrax.

Question to the rest of you who have successfully completed the task: what compiler are you using? I cannot compile with Borland5.5, and the value works in a static array in MSVC++v6 only with a particular change to the struct.

**MrWizard** · 09-23-2004

I used VC++ 2003 .NET

**Fordy** · 09-23-2004

I used the IDE for VC++.NET but I've updated the compiler with the free download for VC++.NET 2003.

The other compilers before that choke on most template stuff.

Other template stuff I have done in the past has been on Codewarrior or MingW

Take a peek over here - http://cboard.cprogramming.com/showthread.php?t=56548. That's a free VC++ compiler that can handle templates pretty well

**LuckY** · 09-24-2004

Thanks for the link Fordy. Unfortunately I can't give it a go here at work because XP is the min OS. Sounds promising, though.

**Fordy** · 09-24-2004

I'm on 2K and works for me

**pianorain** · 09-24-2004

Submitted an entry.

**LuckY** · 09-24-2004

Originally Posted by Fordy

I'm on 2K and works for me

Not to split hairs, but yeah, that's what I meant. XP is the min OS for the "toolkit" and at work I've a mere 98 box...

**xErath** · 09-24-2004

1# First I don't get this:

Code:

char data[ SquareRoot<16>::v ];

If I do something trivial like

Code:

template<int x> const int SquareRoot<x>::v = 2;

I still get compiler errors, like:
error C2057: expected constant expression
error C2466: cannot allocate an array of constant size 0
error C2133: 'data' : unknown size
The template is decided at compile time... Why not the static variable?

**Sang-drax** · 09-25-2004

Are you able to compile this?

Code:

template <int n>
struct Test
{
  static const int v = n;
};

char data[ Test<16>::v ];

If not, try the link Fordy provided and download a better compiler.

Originally Posted by pianorain

Submitted an entry.

I haven't received anything.

**LuckY** · 09-26-2004

I had the same problem and had to resort to change v to an enumerated type (using MSVC6).

**xErath** · 09-26-2004

Originally Posted by Sang-drax

If not, try the link Fordy provided and download a better compiler.

I used both the .NET compiler and my MSVC++6 compiler.. both gave me the same result...
[edit]
worked fine now.. probably distraction of mine

**xErath** · 09-26-2004

Solution sent and it works perfectly!

**Sang-drax** · 09-29-2004

OK, I've lost every contest entry I've receieved so far.

The reason is this:
http://cboard.cprogramming.com/showthread.php?t=57298

Preliminary, this contest is closed for more submissions.

I'm unable to recive and judge more entries (I have no compiler). I know who is the winner though. If it's OK with you, I'll announce the winner and every contestant can post the submission they used.

I've seen your updated submission xErath, but not compiled it. I'm not going to use it when I judge the competition, sorry.