/* 6.914, Example 0.12

You can cause something to change in some quantifiably measurable event
by using an 'if' statement, which takes the form:

if (statement-to-check) {
  code-to-execute
}

In the event that statement-to-check evaluates as true, the code-to-execute will run.
If that statement is false, the code-to-execute will be skipped.

So, for instance, if you want to increment a variable x up until a certain point (like x = 50)
you could run the following code:

if (x < 50){ 
  x++;
}

Here's an example of that in practice.
*/


int startXvar = 50;

void setup(){
  size(200, 200);
}

void draw(){

  background(50); // use background to "clear the screen"

  rect(startXvar, 100, 30, 30);

  startXvar++; 
  
  if (startXvar > 200) {
    startXvar = 30; // as soon as startXvar exceeds 200, it will return to 30
  }

}