Datasheet

Chapter 1 • Your Shield-Bot’s Brain
28 • Robotics with the BOE Shield-Bot
 Create, save, and run SimpleMath on your Arduino.
 Check the result in the Serial Monitor. Is it correct?
// Robotics with the BOE Shield - SimpleMath
void setup()
{
Serial.begin(9600);
int a = 89;
int b = 42;
int c = a + b;
Serial.print("a + b = ");
Serial.println(c);
}
void loop()
{
// Empty, no repeating code.
}
Fit your variables to the result values you need to store. This will use less memory so you
can write larger sketches that will execute more efficiently.
• If you need to work with decimal point values, use
float.
• If you are using integer values (counting numbers), choose
byte, int, or long.
• If your results will always be an unsigned number from 0 to 255, use
byte.
• If your results will not exceed –32,768 to 32,767, an
int variable works.
• If you need a larger range of values, try a
long variable instead. It can store
values from -2,147,483,648 to 2,147,483,647.
Your Turn – Experiment with Other Arithmetic Operators
You still have –, *, /, and % to try out!
 Replace the addition (
+) operator with the subtraction (–) operator. Replace
both instances of
+ in the sketch.
 Run the modified sketch and verify the result in the Serial Monitor.
 Repeat for the multiplication (
*), division (/) and modulus (%) operators.
Floating Point Math
Imagine entering your BOE Shield-Bot in a contest where you have to make it travel in a
circle, but the radius will only be announced a few minutes before the contest. You’d have an
advantage if your code could calculate the circumference of the circle. The formula is 2 × π ×