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Index › Need help with Project Euler question.
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 Need help with Project Euler question. (Read 3025 times)
 Reef Need help with Project Euler question. Jun 17th, 2010, 7:58pm   Quote:If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.Find the sum of all the multiples of 3 or 5 below 1000. I'm learning how to program by doing the math questions form Project Eular. I have no idea why this code doesn't calculate the correct answer: Code:```void setup(){  noLoop();}void draw(){  int sum = 0;  for (int x=0; x < 1000; x+=3){    sum+=x;    println ("x: " + x + " sum: " + sum);  }  //166833  for (int x=0; x < 1000; x+=5){    sum+=x;    println ("x: " + x + " sum: " + sum);  }  //99500}//Total 266333 ```Please give me a tiny little hint!
 guyy Re: Need help with Project Euler question. Reply #1 - Jun 17th, 2010, 9:27pm   think about 15
 Reef Re: Need help with Project Euler question. Reply #2 - Jun 18th, 2010, 3:16am   Thanks! I feel dumb.
 guyy Re: Need help with Project Euler question. Reply #3 - Jun 18th, 2010, 4:23am   no problem - happens to everyone
 guss Re: Need help with Project Euler question. Reply #4 - Jun 18th, 2010, 6:51am   Two things:1) why are you solving math problems and learning the basics of programming in processing I mean, sure there's nothing wrong with it, it just seems a bit odd if you ask me :p2) You should really do some reading on the Modulo operator (%) http://en.wikipedia.org/wiki/Modulo_operation http://processing.org/reference/modulo.html. Your entire program can be written in 9 lines of code while at the same time giving the right answer on a side note though: "multiples of 3 or 5" is that a normal "or" or a "exclusive or" (xor)
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