FunLanguageDesign.md

Fun Language Design

End of line → represented by ':)' symbol.

Statement blocks → starts with '{:' symbol and ends with ':}' symbol.

Reserved words → must be uppercase.

---

Variables

Variable Types → INT CHAR STR BOOL. Arrays are also available.

Rules for Variable Names

Regular expression: [a-z_]+ → lowercase letters and _.

• It must consist of letters or underscores.
• Letters must be lowercase.
• It can not contain any other symbol like digits.

Declaration

variable_name ⇒ INT :)
array_name ⇒ INT[array_size] :)

Initialization

variable_name = 5 :)
array_name[index] = 10 :)

---

Condition statement

Rules

• ELIF and ELSE parts are optional.
• Statements to execute when the condition is met must be written inside a block.

IF (*CONDITION*){: *STATEMENT* :}
ELIF (*ANOTHER_CONDITION*){: *STATEMENT* :}
ELSE {: *STATEMENT* :}

IF (*CONDITION*) {: 
	*STATEMENT* 
:}
ELIF (*ANOTHER_CONDITION*) {: 
	*STATEMENT* 
:}
ELSE{: 
	*STATEMENT* 
:}

Comparison Operators

// example comparison statements. 
variable_x < variable_y
variable_x < 5
5 < variable_x

Loop statement

Rules

• Statements to execute when the condition is met must be written inside a block.

WHILE (*CONDITION*) {:
	*STATEMENT*
:}

Function definition

Rules

• Function statements must start with FUN keyword.

FUN function_name (*TYPE* parameter_name_one, ..., *TYPE* parameter_name_n) => *RETURN_TYPE* {:
	*STATEMENT*
	RETURN return_variable :)f
:}

call the defined function by :

function_name(parameter_name_one, ..., parameter_name_n) :)

Built-in functions

EXIT( ) → to exit the program

PRINT( value ) → to print a value (except for arrays, you should print each element of array separately)