---
epic: 3
story: 3.4
title: "Currency Symbol & Code Recognition"
status: draft
---

## Epic 3 — Currency & Cryptocurrency
**Goal:** Real-time and historical currency conversion with 180+ fiat and 50+ crypto.

### Story 3.4: Currency Symbol & Code Recognition

As a CalcPad user,
I want to use both currency symbols ($, EUR) and ISO codes interchangeably,
So that I can write currency expressions naturally without remembering specific format rules.

**Acceptance Criteria:**

**Given** the expression `$100 to EUR`
**When** the engine evaluates it
**Then** `$` is recognized as `USD` and the conversion to `EUR` is performed

**Given** the expression `100 USD to EUR`
**When** the engine evaluates it
**Then** `USD` is recognized as the same currency as `$`
**And** the result matches `$100 to EUR`

**Given** the expression `€50 in dollars`
**When** the engine evaluates it
**Then** `€` is recognized as `EUR` and `dollars` is resolved to `USD`

**Given** the expression `R$500 in dollars`
**When** the engine evaluates it
**Then** `R$` is recognized as `BRL` (Brazilian Real)
**And** the result is the equivalent in USD

**Given** the expression `¥10000 in USD`
**When** the engine evaluates it
**Then** `¥` is resolved based on context (default: JPY; CNY if specified)

**Given** the expression `100 GBP to £`
**When** the engine evaluates it
**Then** it recognizes that the source and target are the same currency
**And** the result is `£100`