I don't understand the logic behind this code

Question
1

object linda {
def main(args: Array[String]): Unit = {
var lcv = 0;
var loop_start = 0;
var loop_finish = 15;

for (
lcv <- loop_start to loop_finish
if lcv % 3 ==1
) {
println (lcv)
}
}
}

Can someone please explain me how does this work?

2

It’s this part that I am struggling with I don’t understand the % sign and the 3==1

3

% is the modulo operator, so if the remainder is 1, so 7 would cause this
to hit.

HTH,
Jeff

4

% is the modulo operation https://en.wikipedia.org/wiki/Modulo_operation,
i.e. the remainder after division.

5

Can someone explain me how 3 modulo 1 =1,4,7,10 and 13 in Scala.

6

Any integer you can think of modulo 1 is 0 as there is no remainder from
the division by 1. If you think Scala is getting it wrong, post some code.

7

Someone mentioned the bad formatting on the other question. Use the </> thingy.

Avoid var. Use val instead. The compiler should be able to warn that lcv shadows. Open an issue if it doesn’t.

It should also warn for spurious var, maybe with -Xlint.

object linda {
  def main(args: Array[String]): Unit = {
    var lcv = 0
    var loop_start = 0
    var loop_finish = 15

    for (lcv <- loop_start to loop_finish if lcv % 3 == 1) println (lcv)
  }
}
8

-Xlint does warn about some features of the code sample.

It would be amazing if -Yexplain added text for every operator. What does % mean? And so on.

9

lcv % 3 == 1 means, ‘Is the remainder of dividing lcv by 3 equal to 1?’