Random numbers are often used in programming, everywhere from encrypting data to generative design. Processing offers simple function to get a random number:
random([lower Limit],[upper Limit])
void setup()
{
size(500,500);
background(255);
noLoop();
}
void draw()
{
noStroke();
fill(random(100,150),random(0,100),random(150,255));
ellipse(random(0,width),random(0,height),random(10,100),random(10,100));
}
void mousePressed()
{
redraw();
}