C++ Calculator Project

A command-line calculator that supports basic arithmetic operations, mathematical constants, and user-defined variables.

Features

• Basic arithmetic operations: +, -, *, /, ^ (exponentiation)
• Built-in mathematical constants: PI, E
• User-defined variables
• Expression evaluation with proper operator precedence
• Parentheses support for complex expressions

Building

This project uses a Makefile for building. Make sure you have g++ installed with C++17 support.

Build Commands

# Build the project
make

# Build and run
make run

# Clean build artifacts
make clean

# Build debug version
make debug

# Build optimized release version
make release

Usage

After building, run the calculator:

./build/calculator

Example Expressions

2+3          # Addition: 5
2*3+4        # Multiplication with addition: 10
PI*2         # Using built-in constants: 6.28319
(1+2)*3      # Parentheses: 9
2^3          # Exponentiation: 8

Setting Variables

The calculator supports user-defined variables:

Calculator calc;
calc.setVariable("x", 5.0);
// Now you can use 'x' in expressions

Project Structure

• main.cpp - Entry point and demonstration code
• Calculator.cpp - Calculator implementation
• Calculator.hpp - Calculator class definition
• Makefile - Build configuration
• support.cpp - Additional utility functions (not used in main build)

Requirements

• C++17 compatible compiler (g++, clang++)
• Standard C++ libraries

Implementation Details

The calculator uses the shunting yard algorithm to convert infix notation to postfix notation, then evaluates the postfix expression using a stack-based approach.