You are provided with an incomplete program given below. Complete this program by
writing a method called drawBarCode that draws a barcode on the window at a given (x,y)
coordinate. The coordinate (x,y) is the top-left corner of the barcode.  The method also
takes width and height of barcode as arguments, along with (x,y).
A barcode is composed of many vertical lines; some of them are closer to each other,
while some are further apart. Since the width of the barcode is w, there are a total of w
vertical lines. For each line, you should draw it with black color with a 50% probability.
Please note that since the barcode generation is done in a probabilistic environment, you
will get different barcodes for the same method call over various executions.
//start of barCodes.pde
// add method drawBarCode here
void setup() {
  size(400,400);
  background(255);
  drawBarCode(50,50,100,40);
  // add two more calls here
}
void draw() {
}
//end of barCodes.pde

Computing probabilities example -

int r = (int)random(1,5);
//r is either 1 or 2 or 3 or 4.
if ( r < 4 ) {
! ! //3 out of 4 values satisfy this, hence 75% probability
}

if ( r == 1 ) {
//1 out of 4 values satisfy this, hence 25% probability
}

Test your method by drawing barcodes of various sizes. You should include two more
method calls in addition to the one already given in setup(). To the right  is an
example of the results of using the method as follows:

  drawBarCode(50,50,100,40);
  drawBarCode(50,150,200,40);
  drawBarCode(50,250,300,100);