I know hardly anything about processing and have no background in computer programming on a purely logic level so forgive me if my questions seem elementary.

I am trying to understand the syntax and grammar of functions.  I don't know where I am going wrong here though.
It is supposed to draw three balls that change color and move when the mouse is clicked...  But I also wouldl like them to stop when the keyboard is pressed.

So far I can't even get the first part to show.  I get an error message that reads 'expecting LPAREN'

Any help?


CODE:

int speed =0;

void setup(){
  size(800,600);
  background(0);
  smooth();
  //int r = (int)random (0,600);
}
void draw()
{
  if mousePressed() {
    background(0);
    ball_2(0,(int)random (0,100));
    ball_2(0,(int)random (0,50));
    ball_2(0,(int)random (0,25));
    speed = 1;

  }

}
else keyPressed (){
  speed = 0;
}

void ball_2(int xpos, int ypos){
  ellipse(xpos,ypos,100,100);
  fill ((int)random (100,200),(int)random (100,200),(int)random (100,200));
}