Language Reference
Arduino programs can be divided in three main parts: structure, values (variables and constants), and functions.
Structure
· setup()
· loop()
Control Structures
· if
· if...else
· for
· switch case
· while
· do... while
· break
· continue
· return
· goto
Further Syntax
· ; (semicolon)
· {} (curly braces)
· // (single line comment)
· /* */ (multi-line comment)
· #define
· #include
Arithmetic Operators
· = (assignment operator)
· + (addition)
· - (subtraction)
· * (multiplication)
· / (division)
· % (modulo)
Comparison Operators
· == (equal to)
· != (not equal to)
· < (less than)
· > (greater than)
· <= (less than or equal to)
· >= (greater than or equal to)
Boolean Operators
· && (and)
· || (or)
· ! (not)
Pointer Access Operators
· * dereference operator
· & reference operator
Bitwise Operators
· & (bitwise and)
· | (bitwise or)
· ^ (bitwise xor)
· ~ (bitwise not)
· << (bitshift left)
· >> (bitshift right)
Compound Operators
· ++ (increment)
· -- (decrement)
· += (compound addition)
· -= (compound subtraction)
· *= (compound multiplication)
· /= (compound division)
· &= (compound bitwise and)
· |= (compound bitwise or)
Variables
Constants
· HIGH | LOW
· INPUT | OUTPUT| INPUT_PULLUP
· true | false
· integer constants
· floating point constants
Data Types
· void
· boolean
· char
· unsigned char
· byte
· int
· unsigned int
· word
· long
· unsigned long
· short
· float
· double
· string - char array
· String - object
· array
Conversion
· char()
· byte()
· int()
· word()
· long()
· float()
Variable Scope & Qualifiers
· variable scope
· static
· volatile
· const
Utilities
· sizeof()
Functions
Digital I/O
· pinMode()
· digitalWrite()
· digitalRead()
Analog I/O
· analogReference()
· analogRead()
· analogWrite() - PWM
Due only
· analogReadResolution()
· analogWriteResolution()
Advanced I/O
· tone()
· noTone()
· shiftOut()
· shiftIn()
· pulseIn()
Time
· millis()
· micros()
· ...
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