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JavaScript

Posted by Jonathan Hamada
Jonathan Hamada
4,810 Points

While Statements

Got stuck on this While statement algorithm. Thank you!:

Multiples of Six Print multiples of 6 up to 60,000, using a WHILE.

function integers() {
    var i = 1;
    while (i <= 60000) {
      document.write(i + " </br>");
        i++;
      if ((i % 6) === 0) {
      document.write(i + " </br>");
        i++;
    }
  }
}
integers()
Steven Parker
Steven Parker
242,796 Points
Steven Parker
Steven Parker
242,796 Points

Please provide a link to the course page to allow for a complete and accurate analysis.

3 Answers

Sam West-Sooby
Sam West-Sooby
6,203 Points

You are printing twice. Your first document write is printing every time i is less than 60,000. You're also trying to increment i twice, and once inside an if statement which would mean it only increments if i % 6 === 0. You want to increment i during each iteration. Here is how your function should look if you want to print multiples of 6 between i and 60,000 using a while loop.

function integers() {
  var i = 1;
  while (i <= 60000) {
    if ((i % 6) === 0) {
      document.write(i + " </br>");
    }
    i++;
  }
}

integers()
Jonathan Hamada
Jonathan Hamada
4,810 Points
Jonathan Hamada
Jonathan Hamada
4,810 Points

Before I saw your best answer I tried to solve it myself and came out with this code. It seems to run identical to the code you wrote. I just kept the i++ inside the while statement. Is this wrong? Anyways, thanks for helping. I been doing algorithms as extra practice.

var i = 0;

function multiplesOfSix() {
  while (i <= 60000) {
    i++;
    if ((i % 6) === 0) {
      document.write(i + " </br>");
    }
  }
}
multiplesOfSix()
Steven Parker
Steven Parker
242,796 Points
Steven Parker
Steven Parker
242,796 Points

By incrementing first, instead of having a range of 0 to 60000, you would have a range of 1 to 60001. But in this case, since you only print multiples of 6, you might not see any difference.

Sam West-Sooby
Sam West-Sooby
6,203 Points

My i++ is in the while statement, it's just after the if statement. You should really be incrementing i after your if statement, because placing it before the if statement means i increments before your condition, excluding the first instance of i from the condition. Other than that, it's great!

Jonathan Hamada
Jonathan Hamada
4,810 Points
Jonathan Hamada
Jonathan Hamada
4,810 Points

OK, got it! This is just a practice algorithm Steve. It's not from Tree House. Just trying to learn more. Thanks!