1. int rectX, rectY;      // Position of square button
   int circleX, circleY;  // Position of circle button
   int rectSize = 50;     // Diameter of rect
   int circleSize = 53;   // Diameter of circle
   color rectColor, circleColor, baseColor;
   color currentColor;
   boolean rectOver = false;
   boolean circleOver = false;
   
   void setup()
   {
     size(200, 200);
     smooth();
     rectColor = color(0);
     circleColor = color(255);
     baseColor = color(102);
     currentColor = baseColor;
     circleX = width/2+circleSize/2+10;
     circleY = height/2;
     rectX = width/2-rectSize-10;
     rectY = height/2-rectSize/2;
     ellipseMode(CENTER);
   }
   
   void draw()
   {
     update(mouseX, mouseY);
     background(currentColor);
    
     if(rectOver) {
   
       fill(rectColor);
       stroke(0);
       if (mousePressed) {
       line(mouseX, mouseY, pmouseX, pmouseY);
     }
     }
     stroke(255);
     rect(rectX, rectY, rectSize, rectSize);
    
     if(circleOver) {
   
       fill(circleColor);
     }
       stroke(0);
       if(mousePressed) {
       line(mouseX, mouseY, pmouseX, pmouseY);
    
    
     stroke(0);
   ellipse(circleX, circleY, circleSize, circleSize);
   }
   
   void update(int x, int y)
   {
     if( overCircle(circleX, circleY, circleSize) ) {
       circleOver = true;
       rectOver = false;
     } else if ( overRect(rectX, rectY, rectSize, rectSize) ) {
       rectOver = true;
       circleOver = false;
     } else {
       circleOver = rectOver = false;
     }
   }
   
   
   
   boolean overRect(int x, int y, int width, int height)
   {
     if (mouseX >= x && mouseX <= x+width &&
         mouseY >= y && mouseY <= y+height) {
       return true;
     } else {
       return false;
     }
   }
   
   boolean overCircle(int x, int y, int diameter)
   {
     float disX = x - mouseX;
     float disY = y - mouseY;
     if(sqrt(sq(disX) + sq(disY)) < diameter/2 ) {
       return true;
     } else {
       return false;
     }
   }

This seems easy but since I'm beginner I have no idea how to do this. Am I doing it right? what should I change? Also for the second one it says unexpected token but I can't find any problem with it.