It's Primes as far as the eye can see!
-
All odd numbers are prime, right? Let me check. Yep, all odd numbers are prime. Makes it a lot easier to count by the primes. Also, are there more odd numbers or even numbers? I know the answer, but it's a puzzle for you.
newton.saber wrote:
All odd numbers are prime, right?
No, primes aren't just any odd number.
-
OriginalGriff wrote:
call me old fashioned, but in my day, 9, 15 and 21 were divisible by 3
Ya, but that's also back when Pluto was a planet. We live in a very different place now. This user submitted this in QA, got closed, and resubmitted it in QA. I told him to post as a tip but apparently he didn't realize some explanation should be added. Or, the important part, THAT IT SHOULD WORK! :laugh:
There are only 10 types of people in the world, those who understand binary and those who don't.
-
RyanDev wrote:
but that's also back when Pluto was a planet
There was a thing on the telly recently that stated it had been voted back in as a planet.
Dave Find Me On:Web|Facebook|Twitter|LinkedIn Folding Stats: Team CodeProject
-
This is the whole of a would-be Tip submitted today:
public class Class1
{
static void Main(string[] args)
{
Console.WriteLine("Enter a Number");
int num = int.Parse(Console.ReadLine());
for (int i = 1; i <=num ; i++)
{
if(i==2)
Console.WriteLine(2);if (i % 2 != 0) { Console.WriteLine(i); } } } }No text, no explanation - the author (I can only assume he works for Mindfire, it's about their level) clearly felt that it spoke for itself. And boy, does it ever! This, ladies-n-gentlemen, is a Prime Number generator according to the author. So...I tried it... According to this code, the prime numbers under 26 are:
1
2
3
5
7
9
11
13
15
17
19
21
23
25Now, call me old fashioned, but in my day, 9, 15 and 21 were divisible by 3, and both 15 and 25 were divisible by 5... So which is wrong? The Code? Or the Laws of Mathematics? Only the author can tell... :laugh:
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
At least he used the
%operator rather than implementing his own function. -
At least he used the
%operator rather than implementing his own function.I suspect luck was involved.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
-
At least he used the
%operator rather than implementing his own function.Yeah, it could have been worse...
public static bool SeeIfNumberIsOdd(int i)
{
for (int n = i; n > 0; n--)
{
if (n==1)
return true;
else if (n==2)
return false;
}
return true;
}That felt dirty to write... Ok, I probably could have made it a LITTLE worse... Maybe O(n^2), but that might be gratuitous.
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels) -
Yeah, it could have been worse...
public static bool SeeIfNumberIsOdd(int i)
{
for (int n = i; n > 0; n--)
{
if (n==1)
return true;
else if (n==2)
return false;
}
return true;
}That felt dirty to write... Ok, I probably could have made it a LITTLE worse... Maybe O(n^2), but that might be gratuitous.
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)See the mod function in here: http://www.codeproject.com/script/Articles/ArticleVersion.aspx?aid=830657[^]
-
See the mod function in here: http://www.codeproject.com/script/Articles/ArticleVersion.aspx?aid=830657[^]
Bah, I can do better than that!
//TODO: Remove all comments before publishing. Real programmers don't need comments!
public function SuperMod(int n, int o) // o is a great variable, because it looks like a zero
{
int p = o; //Shorter variable names make the code run faster!
loopy: //Labels make me feel young again!
while (p < n) p += o;
if (p < n) goto loopy; //Just in case the compiler makes a mistake
int answer = p - n;
return answer;
}Ok, I think that's about as bad as I can make it, and though I didn't test it at all (Honestly, I think the compiler would come to life and slit my throat for even trying to execute this monstrosity), that should technically give the right answer... Unless 'o' is negative or zero, but validating parameters is so 20th century...
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels) -
Bah, I can do better than that!
//TODO: Remove all comments before publishing. Real programmers don't need comments!
public function SuperMod(int n, int o) // o is a great variable, because it looks like a zero
{
int p = o; //Shorter variable names make the code run faster!
loopy: //Labels make me feel young again!
while (p < n) p += o;
if (p < n) goto loopy; //Just in case the compiler makes a mistake
int answer = p - n;
return answer;
}Ok, I think that's about as bad as I can make it, and though I didn't test it at all (Honestly, I think the compiler would come to life and slit my throat for even trying to execute this monstrosity), that should technically give the right answer... Unless 'o' is negative or zero, but validating parameters is so 20th century...
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)Ian Shlasko wrote:
give the right an answer
FTFY
-
newton.saber wrote:
All odd numbers are prime, right?
No, primes aren't just any odd number.
PIEBALDconsult wrote:
No, primes aren't just any odd number.
Of course they are. It's ridiculous to think that they aren't.
-
newton.saber wrote:
it's a puzzle for you.
Not really: there are an infinite quantity of each. The way we define "more", "less", and "equal" for infinite quantities is as follows. For two collections A and B (say A are the even numbers and B are the odd numbers) we say that If you can associate every item in A with a unique item in B, and vice versa, then A and B are the same size. If you can associate every item in A with a unique item in B, but not vice versa, then B is bigger than A. If you can associate every item in B with a unique item in A, but not vice versa, then A is bigger than B. In this case you can associate every even number n with the odd number n+1, and you can associate every odd number m with the even number m−1 (assuming 0 is even) so therefore there are just as many odd numbers as even numbers.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
This is terribly incorrect, because I stopped counting on an odd number, so there are more odd numbers than even. Thank you for your input. :D
-
This is the whole of a would-be Tip submitted today:
public class Class1
{
static void Main(string[] args)
{
Console.WriteLine("Enter a Number");
int num = int.Parse(Console.ReadLine());
for (int i = 1; i <=num ; i++)
{
if(i==2)
Console.WriteLine(2);if (i % 2 != 0) { Console.WriteLine(i); } } } }No text, no explanation - the author (I can only assume he works for Mindfire, it's about their level) clearly felt that it spoke for itself. And boy, does it ever! This, ladies-n-gentlemen, is a Prime Number generator according to the author. So...I tried it... According to this code, the prime numbers under 26 are:
1
2
3
5
7
9
11
13
15
17
19
21
23
25Now, call me old fashioned, but in my day, 9, 15 and 21 were divisible by 3, and both 15 and 25 were divisible by 5... So which is wrong? The Code? Or the Laws of Mathematics? Only the author can tell... :laugh:
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
-
This is the whole of a would-be Tip submitted today:
public class Class1
{
static void Main(string[] args)
{
Console.WriteLine("Enter a Number");
int num = int.Parse(Console.ReadLine());
for (int i = 1; i <=num ; i++)
{
if(i==2)
Console.WriteLine(2);if (i % 2 != 0) { Console.WriteLine(i); } } } }No text, no explanation - the author (I can only assume he works for Mindfire, it's about their level) clearly felt that it spoke for itself. And boy, does it ever! This, ladies-n-gentlemen, is a Prime Number generator according to the author. So...I tried it... According to this code, the prime numbers under 26 are:
1
2
3
5
7
9
11
13
15
17
19
21
23
25Now, call me old fashioned, but in my day, 9, 15 and 21 were divisible by 3, and both 15 and 25 were divisible by 5... So which is wrong? The Code? Or the Laws of Mathematics? Only the author can tell... :laugh:
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
That's odd!
Life is like a s**t sandwich; the more bread you have, the less s**t you eat.
-
RyanDev wrote:
but that's also back when Pluto was a planet
There was a thing on the telly recently that stated it had been voted back in as a planet.
Dave Find Me On:Web|Facebook|Twitter|LinkedIn Folding Stats: Team CodeProject
That's democracy for you!
Life is like a s**t sandwich; the more bread you have, the less s**t you eat.
-
Ian Shlasko wrote:
give the right an answer
FTFY
Heh, yeah, you're right... It needs to be n+o-p... But hey, what's the point of testing when you're trying to write the worst code possible? (Still haven't tested... I was going to, but the compiler pulled a knife on me and said some very non-KSS things would happen if I tried)
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels) -
Bah, I can do better than that!
//TODO: Remove all comments before publishing. Real programmers don't need comments!
public function SuperMod(int n, int o) // o is a great variable, because it looks like a zero
{
int p = o; //Shorter variable names make the code run faster!
loopy: //Labels make me feel young again!
while (p < n) p += o;
if (p < n) goto loopy; //Just in case the compiler makes a mistake
int answer = p - n;
return answer;
}Ok, I think that's about as bad as I can make it, and though I didn't test it at all (Honestly, I think the compiler would come to life and slit my throat for even trying to execute this monstrosity), that should technically give the right answer... Unless 'o' is negative or zero, but validating parameters is so 20th century...
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels)Cut and pasted ! :laugh:
-
Cut and pasted ! :laugh:
Ok, but if you're gonna use that code, make sure to either fix the bug, or... uh... only test with (4,2).
Proud to have finally moved to the A-Ark. Which one are you in?
Author of the Guardians Saga (Sci-Fi/Fantasy novels) -
This is terribly incorrect, because I stopped counting on an odd number, so there are more odd numbers than even. Thank you for your input. :D
You might get a more accurate result if you start at infinity and count backward.
-
You might get a more accurate result if you start at infinity and count backward.
-
RyanDev wrote:
but that's also back when Pluto was a planet
There was a thing on the telly recently that stated it had been voted back in as a planet.
Dave Find Me On:Web|Facebook|Twitter|LinkedIn Folding Stats: Team CodeProject
DaveAuld wrote:
it had been voted back in as a planet
That is such a coincidence because I've just been voted in as a planet too. Very cool. I hope to be voted in as a Sun one day so I can go by the name Apollo. It's such a cool name. Plus then all you people will have to rotate around me and I'll be the center of your Universe. Yes, the sun is the center of the Universe. I pre-emptively struck on your future humor that I didn't know that the sun was the center of a solar system. Wham!
