C++ Console Calculator (Evolution & Refactor)

A practical C++ project showcasing the step-by-step evolution from a monolithic prototype to a clean, modular architecture.

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Project Overview

This repository demonstrates fundamental software engineering principles in C++, focusing on refactoring, memory management, and code readability.

• Version 1 (calculator_v1_monolithic.cpp): Initial prototype managing input flow, multiple menu loops, and arithmetic operations within a single monolithic execution block.
• Version 2 (calculator_v2_modular.cpp): Refactored architecture decomposing tasks into dedicated functions, implementing memory-efficient references, and handling edge cases.

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Key Technical Features (v2)

• Modular Architecture: Functional decomposition separating user interface, input capture, and math operations (sumar, restar, multiplicar, dividir).
• Pass-by-Reference (double &): Used in pedirnumeros() to modify variables directly across scopes without unnecessary memory copies.
• Flow Control: Streamlined operation routing using a clean switch statement instead of deeply nested conditional blocks.
• Error Handling: Explicit division-by-zero validation to prevent runtime crashes.
• Console Localization: Configured Windows UTF-8 console output (SetConsoleCP / SetConsoleOutputCP) for proper character and accent rendering.

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Tech Stack & Requirements

• Language: C++ (C++11 or higher)
• Compiler: MinGW / GCC / MSVC
• Platform: Windows (Console)

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How to Compile and Run

Clone the repository and compile using any standard C++ compiler:

# Compile Version 2
g++ -o calculator calculator_v2_modular.cpp

# Run executable
./calculator