ilukemagic / rust-calculator-cli

A simple command-line calculator application written in Rust that supports basic arithmetic operations.

Rust Calculator CLI

A simple command-line calculator application written in Rust that supports basic arithmetic operations.

Features

• Interactive command-line interface
• Supports basic arithmetic operations:
  • Addition (+)
  • Subtraction (-)
  • Multiplication (*)
  • Division (/)
• Error handling for invalid inputs
• Follows order of operations (multiplication and division before addition and subtraction)

Installation

Prerequisites

• Rust and Cargo (install from https://www.rust-lang.org/tools/install)

Building from Source

1. Clone the repository:

   git clone https://github.com/yourusername/rust-calculator-cli.git
   cd rust-calculator-cli
   

2. Build the project:

   cargo build --release
   

3. Run the calculator:

   cargo run --release
   

Usage

After starting the application, you'll see a prompt where you can enter mathematical expressions:

Welcome to the Rust Calculator!
Enter 'quit' to exit.
> 2 + 3
Tokens: [Number(2.0), Plus, Number(3.0)]
Result: 5
> 10 * 5 - 8
Tokens: [Number(10.0), Multiply, Number(5.0), Minus, Number(8.0)]
Result: 42
> quit

Supported Operations

• Addition: a + b
• Subtraction: a - b
• Multiplication: a * b
• Division: a / b

The calculator follows the standard order of operations (multiplication and division before addition and subtraction).

Project Structure

• src/main.rs: Contains all the calculator logic including tokenization, parsing, and evaluation

Development

Building and Testing

# Build the project
cargo build

# Run the tests
cargo test

# Run the application
cargo run

License

This project is open source and available under the MIT License.