LEARN VOID / 02

Variables & constants

Give values a name.

Complete program for the synchronous entry adapter. The result below is the returned integer.

const unit_price: i32 = 3

func entry(quantity: i32) -> i32:
    var total = quantity * unit_price
    total += 2
    const amount_due = total
    return amount_due

Input 5Expected result 17

Infer local types

var total = quantity * unit_price creates a mutable integer binding. With quantity 5 and unit price 3, the subtotal is 15. The compiler infers i32 from the typed operands.

Update an existing value

total += 2 adds a fixed delivery fee, bringing the amount due to 17. Assignment updates an existing binding; it does not silently declare another variable.

Make readonly intent visible

The module-level unit_price is a typed compile-time constant. The local amount_due is a readonly binding computed during execution. Neither binding can be reassigned. For managed objects, readonly access restricts that view; another mutable alias can still change the same object.