Expressions and Operators

This document covers how to compute and compare values in Junlang.

What is an expression?

An expression is a piece of code that produces a value. For example, 1 + 2 is an expression, and its result is the value 3.

The simplest expression in Junlang is a number by itself.

오

This code alone is an expression, and its value is 1. By adding operators, you can build more complex expressions.

Arithmetic Operators

Junlang	Meaning	Common Equivalent
~	Addition	+
.	Multiplication	*
..	Exponentiation	**
#	Division	/

오~오오

1 + 2, so the result is 오오오(3).

오오.오오오

2 × 3, so the result is 오오오오오오(6).

오오..오오오

2³, so the result is 오오오오오오오오(8).

There is no subtraction operator

Junlang has no dedicated subtraction operator. Instead, combine the negative sign ? with addition ~.

오~?오

1 + (-1) → 오?(0)

What happens when you divide by 0 or raise to a decimal power?

An error occurs. (See: Errors)

Division by zero:

이건 기하반도 안 하는 실수인데?

Decimal exponent:

준서가 어렵대

Comparison Operators

Junlang	Meaning	Common Equivalent
@	Equal to	==
!@	Not equal to	!=
ㅁ	Less than	<
ㅊ	Greater than	>
ㅁ@	Less than or equal to	<=
ㅊ@	Greater than or equal to	>=

The result of a comparison operator is always 오(1, true) or 오?(0, false).

오@오

1 == 1 → 오(true)

오오ㅁ오오오

2 < 3 → 오(true)

오오오ㅁ@오오

3 <= 2 → 오?(false)

Don't confuse !@ with variables

Since ! is also used as a variable name, the following two pieces of code have completely different meanings.

Code	Interpretation
!@오오	variable 1 == 2
!!@오오	variable 1 != 2

For detailed rules, see Inline Writing Rules.

Unary Operators

Operators that require only one operand.

Junlang	Meaning	Common Equivalent
?	Negative sign	-
!	Logical NOT	!

?오오

-2

!오

not 1 → 오?(0)

!오?

not 0 → 오(1)

The dual meaning of !

! is both a unary operator and a variable name. The interpreter distinguishes between them based on context.

Code	Interpretation
!오	not 1 (negation operator)
!~오	variable 1 + 1 (variable name)

If ! is followed by a value, it's the negation operator; if followed by an operator, it's a variable name.

Operator Precedence

When an expression contains multiple operators, those with higher precedence are computed first.

Rank	Operator	Description
1 (highest)	?, !	Unary operators
2	..	Exponentiation
3	., #	Multiplication, Division
4	~	Addition
5 (lowest)	@, !@, ㅁ, ㅊ, ㅁ@, ㅊ@	Comparison operators

Operators with the same precedence are evaluated left to right (left-associative).

오~오오.오오오

1 + 2 × 3 → 1 + 6 → 오오오오오오오(7)

오오오#오오#오오

(3 ÷ 2) ÷ 2 → 0.75

Step-by-step walkthrough

오~오오.오오오 (1 + 2 × 3)

1. Multiplication has higher precedence than addition, so it's computed first.
   • 오오.오오오 → 2 × 3 → 오오오오오오(6)
2. Then addition.
   • 오~오오오오오오 → 1 + 6 → 오오오오오오오(7)

오오..오오오.오오 (2³ × 2)

1. Exponentiation has higher precedence than multiplication, so it's computed first.
   • 오오..오오오 → 2³ → 오오오오오오오오(8)
2. Then multiplication.
   • 오오오오오오오오.오오 → 8 × 2 → 오 오오오오오(16)

TIP

To explicitly change precedence, use 준, 서.

Assignment Operator

Used to store the result of an expression in a variable.

[expression]~준서[variable name]ㅋ

This operator assigns [expression] to [variable name].

ㅋ is not part of the assignment operator

ㅋ acts as a terminator at the end of a statement. (Or as a decimal point) See Statements and Blocks for details.

오~준서!ㅋ

Assigns 오(1) to variable 1 (!).

오오오~준서!!ㅋ

Assigns 오오오(3) to variable 2 (!!).

오~오오~준서!!!ㅋ

Assigns 오~오오(1 + 2 = 3) to variable 3 (!!!). The expression is evaluated first, then the result is stored in the variable.

TIP

For more on variables, see Variables.