I don't know why only "for" works while "while" is not working

soonk

1. code by "while" void draw() { x=0; y=0; while(x<width){ x=x+20;

   while(y<height){ y=y+20; star(x,y); }

   }

2. code by "for"

void draw() { for (x=0; x<width;x= x+20) { for (y=0; y<height;y= y+20) { star(x, y); } } }

variables, x&y were defined already, and star() also was defined based off of variables x and y.

why only the "for" function works here? and what should I do to make the "while" function work as well?

Always thank you for everyone helping me.

GoToLoop

https://Forum.Processing.org/two/discussion/15473/readme-how-to-format-code-and-text

You've gotta reset y iterator variable back to its initial value for the inner while () {} loop before it starts every time! L-)

for () {} loops automatically reset their iterator back to its initial value before they start. \m/

// Forum.Processing.org/two/discussion/24017/
// i-don-t-know-why-only-for-works-while-while-is-not-working#Item_1

// GoToLoop (2017-Sep-04)

final int STEP = 20, DIAM = STEP >> 1, RAD = DIAM >> 1;

smooth(3);
noLoop();
noStroke();

colorMode(RGB);
blendMode(REPLACE);
rectMode(CORNER);

clear();
int x = RAD; // initial value

while (x < width) {
  fill((color) random(#000000));
  int y = RAD; // reset to initial value

  while (y < height) {
    rect(x, y, DIAM, DIAM);
    y += STEP; // increment by step
  }

  x += STEP; // increment by step
}