Quote:


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!

Thanks! I feel dumb.

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 :p

2) 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)