Datasheet

Your Shield-Bot’s Brain • Chapter 1
Robotics with the BOE Shield-Bot • 35
Want to condense your code a little? You can use the increment operator (++) to increase
the value of
i inside the Serial.println statement. Notice that ++ is on the left side of the
i variable in the example below. When ++ is on the left of a variable, it adds 1 to the value of
i
before the println function executes. If you put ++ to the right, it would add 1
after
println executes, so the display would start at zero.
int i = 0;
while(i < 10)
{
Serial.println(++i);
delay(500);
}
The loop function, which must be in every Arduino sketch, repeats indefinitely. Another
way to make a block of statements repeat indefinitely in a loop is like this:
int i = 0;
while(true)
{
Serial.println(++i);
delay(500);
}
So why does this work? A while loop keeps repeating as long as what is in its parentheses
evaluates as true. The word 'true' is actually a pre-defined constant, so
while(true) is
always true, and will keep the
while loop looping. Can you guess what while(false)
would do?
 Try these three different
while loops in place of the for loop in the CountToTen
sketch.
 Also try one instance using
Serial.println(++i), and watch what happens in
the Serial Monitor.
 Try
while(true) and while(false) also.