====== Addition, Subtraction, Multiplication, & Division   ======

==== Description   ====

These operators return the sum, difference, product, or quotient (respectively) of the two operands.  The operation is conducted using the data type of the operands, so, for example, //9 / 4// gives //2// since 9 and 4 are ints.  This also means that the operation can overflow if the result is larger than that which can be stored in the data type (e.g. adding 1 to an [[arduino:data_types:int|]] with the value 32,767 gives -32,768).  If the operands are of different types, the "larger" type is used for the calculation.

If one of the numbers (operands) are of the type **float** or of type **double**, floating point math will be used for the calculation.
 

====Examples   ====
<code arduino>
y = y + 3;
x = x - 7;
i = j * 6;
r = r / 5;
</code>

====Syntax   ====

<code arduino>
result = value1 + value2;
result = value1 - value2;
result = value1 * value2;
result = value1 / value2;
</code>

====Parameters:   ====

value1: any variable or constant

value2: any variable or constant

====Programming Tips:   ====

* Know that [[arduino:data_types:int|integer constants]] default to [[arduino:data_types:int|]], so some constant calculations may overflow (e.g. 60 * 1000 will yield a negative result).

* Choose variable sizes that are large enough to hold the largest results from your calculations

* Know at what point your variable will "roll over" and also what happens in the other direction e.g. (0 - 1) OR (0 - - 32768)

* For math that requires fractions, use float variables, but be aware of their drawbacks: large size, slow computation speeds

* Use the cast operator e.g. (int)myFloat to convert one variable type to another on the fly.







Source: arduino.cc