Decodal/doc/manual/souce/language/expression/arithmetic.md

Arithmetic Expression

Decodal supports arithmetic over concrete numeric values.

{
    workers = 2 + 2;
    timeout = 30.0 / 2;
    port = 8000 + 80;
    negative = -1;
}

Operators

• + addition
• - subtraction
• * multiplication
• / division
• unary - negation

* and / bind tighter than + and -. Parentheses can be used to make grouping explicit.

2 + 3 * 4     # 14
(2 + 3) * 4   # 20

Numeric behavior

Arithmetic requires concrete Int or Float operands. Int + Int, Int - Int, and Int * Int produce Int when no overflow occurs. Mixed Int / Float arithmetic produces Float. Division always produces Float.

Division by zero and integer overflow are evaluation errors.

Arithmetic expressions can be used anywhere a concrete numeric expression is expected, including defaults and numeric constraints.

port = Int & > 4000 + 42 default 8080;