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Don't you just love infinate loops?
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(Pssst, I think he used a <, but didn't remember to use < when he posted.)
-- modified at 20:41 Thursday 14th June, 2007
int Primes[]={2,3,5,7,...,113};
int size=sizeof(Primes[])/sizeof(Primes[0]);
int i=0;
while (i<size)
{
if (num==Primes[i]) return true;
}
return false;
But you're right, it lacks i++ .
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That is again Horror Coding
Regards,
Sylvester G
sylvester_g_m@yahoo.com
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Your nick is a coding horror by itself! Make it small like all the other please
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Thank you sir ..I did that...
Regards,
Sylvester G
sylvester_g_m@yahoo.com
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MSVC++ generates an error on the above code.;)
// why not having then: int Primes[]={2,3,5,7,...};
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Beh, any real programmer would write it like this:
int primes[] = {2,3,5,...133};
const int* end = primes + sizeof(primes)/sizeof(int);
return (std::find(primes, end, num) != end);
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And any real engineer would build something like this:
bool IsPrime(int i)
{
if (i<2)
return false;
if (i == 2)
return true;
if (i%2 == 1)
return true;
else
return false;
}
Regards,
mav
--
Black holes are the places where God divided by 0...
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Ah, but in .net (C#) we can use a (generic) dictionary and an enum to further extend the required functionality...
public static partial class NumberKeeper
{
[System.FlagsAttribute]
public enum NumberProperty
{
None = 0
,
Odd = 1
,
Even = 2
,
Positive = 4
,
Negative = 8
,
Prime = 16
,
PowerOfTwo = 32
,
Square = 64
,
Cube = 128
,
Fibonacci = 256
,
Factorial = 512
} ;
public static readonly System.Collections.Generic.Dictionary<int,NumberProperty> Numbers ;
static NumberKeeper
(
)
{
Numbers = new System.Collections.Generic.Dictionary<int,NumberProperty>() ;
Numbers.Add ( 0 , NumberProperty.None ) ;
Numbers.Add ( 1 , NumberProperty.Odd | NumberProperty.Positive | NumberProperty.PowerOfTwo | NumberProperty.Fibonacci | NumberProperty.Factorial ) ;
Numbers.Add ( 2 , NumberProperty.Even | NumberProperty.Positive | NumberProperty.Prime | NumberProperty.PowerOfTwo | NumberProperty.Fibonacci | NumberProperty.Factorial ) ;
Numbers.Add ( 3 , NumberProperty.Odd | NumberProperty.Positive | NumberProperty.Prime | NumberProperty.Fibonacci ) ;
Numbers.Add ( 4 , NumberProperty.Even | NumberProperty.Positive | NumberProperty.Square | NumberProperty.PowerOfTwo ) ;
Numbers.Add ( 5 , NumberProperty.Odd | NumberProperty.Positive | NumberProperty.Prime | NumberProperty.Fibonacci ) ;
Numbers.Add ( 6 , NumberProperty.Even | NumberProperty.Positive | NumberProperty.Factorial ) ;
Numbers.Add ( 7 , NumberProperty.Odd | NumberProperty.Positive | NumberProperty.Prime ) ;
Numbers.Add ( 8 , NumberProperty.Even | NumberProperty.Positive | NumberProperty.Cube | NumberProperty.PowerOfTwo | NumberProperty.Fibonacci ) ;
Numbers.Add ( 9 , NumberProperty.Odd | NumberProperty.Positive | NumberProperty.Square ) ;
Numbers.Add ( 10 , NumberProperty.Even | NumberProperty.Positive ) ;
Numbers.Add ( -1 , NumberProperty.Odd | NumberProperty.Negative ) ;
Numbers.Add ( -2 , NumberProperty.Even | NumberProperty.Negative ) ;
Numbers.Add ( -3 , NumberProperty.Odd | NumberProperty.Negative ) ;
Numbers.Add ( -4 , NumberProperty.Even | NumberProperty.Negative ) ;
Numbers.Add ( -5 , NumberProperty.Odd | NumberProperty.Negative ) ;
Numbers.Add ( -6 , NumberProperty.Even | NumberProperty.Negative ) ;
Numbers.Add ( -7 , NumberProperty.Odd | NumberProperty.Negative ) ;
Numbers.Add ( -8 , NumberProperty.Even | NumberProperty.Negative | NumberProperty.Cube ) ;
Numbers.Add ( -9 , NumberProperty.Odd | NumberProperty.Negative ) ;
Numbers.Add ( -10 , NumberProperty.Even | NumberProperty.Negative ) ;
return ;
}
private static bool
HasProperty
(
int Subject
,
NumberProperty Property
)
{
return ( Numbers.ContainsKey ( Subject ) && ( ( Numbers [ Subject ] & Property ) == Property ) ) ;
}
public static bool
IsPrime
(
int Subject
)
{
return ( HasProperty ( Subject , NumberProperty.Prime ) ) ;
}
}
(I'd also add XML serialization of the list.)
Which begs the question: "Sophisticated or sophomoric?"
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Is this real c# code or just a joke? I don't know the language but it looks pretty ugly to me...
We're in the pipe, five by five - Terran dropship.
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Yes, just formatted "my way".
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yowch! Glad I don't have to maintain any of your code.
--
You have to explain to them [VB coders] what you mean by "typed". their first response is likely to be something like, "Of course my code is typed. Do you think i magically project it onto the screen with the power of my mind?" --- John Simmons / outlaw programmer
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The guy is hidden a genious! He calculated the prime numbers up to 113 without assistance! I would have stopped at 19...
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I do kinda feel sorry for him. I hope you crushed his dreams of being a programmer.
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He is a genius - always staying in business with a new update of primes!!
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ROFL ! I REALLY hope that he doesn't get hired to program an elevator controller or people will will wait a long time before getting to their level.
Je vous salue du Québec !
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During starting my career as VC programmer and my first multithread program
I used the while loop and global variable to wait for thread to finish.
I always recall it when ever I write WaitForSingleObject after that.
<br />
DWORD dwStart = GetTickCount();<br />
<br />
while( m_sManagerNode.IsEmpty() == FALSE ){<br />
if( GetTickCount() - dwStart >= 60000 ){<br />
bReturn = FALSE; <br />
break;<br />
}<br />
}<br />
return( TRUE );<br />
Regards
Anil
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Well, you made the lazy CPU working...
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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No worries, one Sleep could save you
codito ergo sum
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I think it already happened to everyone to rewrite existing code or API just because one did not know that the code already existed.
In a different manner, as I was a student, it took me one week to transform serial signals (-12/+12 Volts) into a (0/+5V) signals using all kind of electronic beings (resistance, amplifier, ...) just to find out after that that someone had already thought about the problem and that we could buy RS232 integrated circuits everywhere.
Constantly "Saving the day" should be taken as a sign of organizational dysfunction rather than individual skill - Ryan Roberts[^]
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