Getting Started with Arduino

COMPOUND OPERATORS

These are special operators used to make code more concise for some very common operations like incrementing a value.

For example, to increment value by 1 you would write:

value = value +1;

but using a compound operator, this becomes:

value++;

increment and decrement (–– and ++)

These increment or decrement a value by 1. Be careful, though. If you write i++ this increments i by 1 and evaluates to the equivalent of i+1; ++i evaluates to the value of i then increments i. The same applies to ––.

+= , –=, *= and /=

These make it shorter to write certain expressions. The following two expressions are equivalent:

a = a + 5;
a += 5;