About a project of processing .. I need a help

Processing Coding Questions
11

You have a link to a wikipedia article that explains how Euclide Algorithm is working.

The skeleton of your code should be like this:

void setup() {
  println(pgcd(21, 15));
}

int pgcd(int a, int b) {
  // TO DO
}

You need o replace “TO DO” with some code as explained in the wikipedia article.