operators.md

Documentation

• Bytecode
• Configuration
• Performance
• Comments //
• Conditions if else end
• Constants true false HIGH LOW INPUT OUTPUT
• Cycles for while next break continue
• Functions function locals return done
• Macros macro
• Numeric variables @ @[]
• Operators + - * / % == != > >= < <= && || & | ^ >> << ++ -- ~ not
• Strings : :[]
• System functions adc read args char cursor delay file close file open file read file write pipe close pipe open pipe read pipe write include index input io open io read io write mem millis number numeric print random restart serial open serial read serial write size stop string
• Unary operators ++ --

Operators

Arithmetic	Logic	Bitwise	Unary prefix
+ Addition	== Equal	& And	++ Increment then use
- Subtraction	!= Not equal	| Or	-- Decrement then use
* Multiplication	< Less	^ Xor	~ Bitwise not
/ Division	<= Less or equal	<< Left shift	not Logic not
% Modulus	> Greater	>> Right shift
	>= Greater or equal
	&& And
	|| Or

Operator precedence

BIPLAN uses a layered recursive descent parser that naturally enforces standard mathematical hierarchy that perfectly mirrors standard C precedence:

1. Factor: Parentheses, numbers, constants, variables, function calls and system functions
2. Term: *, /, %
3. Expression: +, -, &, |, ^, <<, >>
4. Relation: ==, !=, <, >, <=, >=, &&, ||

For this reason this expression 2 + 3 * 4 evaluates to 14; multiplication has a higher precedence than addition.

Operator syntax

In BIPLAN the following program is incorrect:

if 1 == 1 || 0 == 0 print "OK" end

The correct form is:

if (1 == 1) || (0 == 0) print "OK" end

Parenthesis are required for the interpreter to detect a nested relation and compute it before the primary relation.