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Code Block
int length1 = 150;
int length2 = 200;
 
size(300,300); // define window size 
background(0); // define background colour
stroke(255,255,255); // define line colour
 
line(100,10,100,length1); // draw a line 
line(150,10,150,length2);
line(200,10,200,250);
 
fill(0,0,0); // fill colour
strokeWeight(5); // line thickness 
ellipse(100,length1,50,50); // draw an ellipse
ellipse(150,length2,50,50); // draw an ellipse
noFill(); // turn off fill
ellipse(200,250,50,50); // draw an ellipse

Operators 

An operator is a symbol that tells Processing to perform a simple task, like for arithmetic and logic. 

+ Addition

/ Devision

- Subtraction

* Multiplacation 

These you already know but there are some very useful arithmetic operators you may not have seen in the following example .

Code Block
int x1 = 10;

x1++; // increment value by one 
x1--; // decrement value by one
 
x1 += 2; // Add assign, this is the same as writing x1 = x1+4; 
x1 -= 2; // Subtract assign, this is the same as writing x1 = x1-4; 
x1 /= 2; // Divide assign (less common), this is the same as writing x1 = x1/2; 


Exercise 2:

Take your results form exercise 1 and modify your code to use variables. Create a variable X and variable Y that can be used to position your graphic on the screen.