💰 Interest Calculator — Inflation-Aware Investment Simulator

A terminal-based financial simulation tool that helps you project long-term investments while adjusting for inflation.
Built in C, with CSV and chart output powered by Gnuplot.

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📜 Project Overview

Interest Calculator is a simple yet powerful CLI program written in C that simulates compound investment growth over a specified period.
It accounts for both interest (growth) and inflation (devaluation) and outputs a clean .csv dataset along with a visual chart.
It’s ideal for analyzing financial plans!

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⚙️ Features

• 🧾 Custom currency input ($ / ₺ / € / etc.)
• 📈 Compound interest support (monthly rate)
• 📉 Yearly inflation adjustment
• 📅 Time range in months
• 📄 Outputs a .csv file with:
  • Raw value over time
  • Inflation-adjusted value
  • Formatted amounts for readability
• 📊 Gnuplot integration:
  • PNG chart with two plotted lines:
    • Raw growth
    • Inflation-adjusted growth
• 📂 Filename customization for saving results
• 🧮 Localized formatting for large numbers

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🛠️ Technologies Used

• Language: C
• Dependencies: math.h, stdio.h, stdlib.h, string.h
• External Tool: Gnuplot (for chart generation)
• Output format: CSV, PNG

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📦 Build & Run Instructions

🧰 Requirements

• GCC compiler
• Gnuplot installed and in your PATH

🔨 Build

Build using

gcc -o wCurrency src/V_2/V2.2.c -lm

Run using

./wCurrency

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🤫 Upcoming Features

• API intergration for realtime currency comparison.
• Running website w/UI for ease of use.
• Edge Case handling. Since this is just a work progress.

⭐️ Feel free to drop a star!