Currency Converter

A simple command-line currency converter built with Go. Convert between different currencies using real-time exchange rates.

Features

• Interactive terminal UI with dropdown menus
• Real-time exchange rates from OpenExchangeRates API
• Support for 9 major currencies including Nigerian Naira
• Input validation to prevent errors
• Multiple conversions in one session
• Clean, formatted output with exchange rate details

Supported Currencies

• USD (US Dollar)
• EUR (Euro)
• GBP (British Pound)
• JPY (Japanese Yen)
• CAD (Canadian Dollar)
• AUD (Australian Dollar)
• CHF (Swiss Franc)
• CNY (Chinese Yuan)
• NGN (Nigerian Naira)

Prerequisites

• Go 1.19 or higher
• OpenExchangeRates API key (free tier available)

Installation

1. Clone this repository:

git clone <your-repo-url>
cd currency-converter

2. Install dependencies:

go mod tidy

3. Create a .env file in the project root:

KEY=your_openexchangerates_api_key_here

4. Get your free API key from OpenExchangeRates

Usage

Run the program:

go run main.go

The app will guide you through:

1. Selecting source currency
2. Selecting target currency
3. Entering amount to convert
4. Viewing the conversion result
5. Option to do another conversion

Example Output

Convert from: US Dollar
Convert to: Nigerian Naira
Amount: 100

100.00 USD = 164750.00 NGN
Exchange rate: 1 USD = 1647.5000 NGN

Do you want to perform another conversion? Yes

Dependencies

• huh - Terminal forms and prompts
• godotenv - Load environment variables from .env file

Error Handling

The app handles common errors like:

• Missing or invalid API key
• Network connectivity issues
• Invalid number input
• Same currency conversions
• Unsupported currencies