// (comment)

Explanatory notes embedded within the code. Comments are used to remind yourself and to inform others about the details of the code. Single-line comments are signified with the two forward slash characters. Comments are ignored by the compiler.

• // Draws two lines which divides the window
  // into four quadrants
  line(0, 50, 100, 50); // Draw the horizontal line
  line(50, 0, 50, 100); // Draw the vertical line
  

• // comment

• commentany sequence of characters

• multilinecomment
• doccomment