🚀 I Built a Command-Line Calculator in C (v1 & v2) — Now I’m Working on a GTK GUI Version (v3)
👋 Hi! I’m Guntu Jothi Ganesh, a 18-year-old self-taught developer with a growing passion for system-level programming and open-source. I recently completed two versions of a command-line calculator using C, and now I'm building a GUI version using GTK+ 3 on Windows.
This post is a quick showcase of my progress, what I’ve learned, and what I’m working toward.
🛠️ What I Built
🔹 Version 1: Basic Calculator
- Operates with
+,-,*,/
- Takes two inputs and an operator
- Displays a result with simple output
🔹 Version 2: Improved CLI Calculator
- 🔁 Added a loop for continuous calculations
- ❌ Checks for divide-by-zero
- 🎯 Cleaner input/output formatting
- 🧹 Graceful exit
📂 GitHub: calculator_v2.c
🧩 Now Building: Version 3 - GUI Calculator with GTK
I’m currently working on a graphical calculator using GTK+ — built in C with a nice interface, buttons for input, and result display in a GUI window.
GTK Features in Progress:
- 🖱️ Buttons for digits and operations
- 🪟 GTK window with layout design
- 🧠 Future plan: scientific operations (log, sin, cos, etc.)
- 💡 Learning how to use GTK in MSYS2 on Windows
📂 GitHub (work-in-progress): gtk_calculator_v3
🔍 What I’ve Learned So Far
- Using
switch-case, input handling, and loops in C - How to avoid
scanfpitfalls - Writing readable, maintainable C code
- Compiling GTK projects with
gccandpkg-config
- Publishing releases and managing GitHub repos
🎯 What’s Next?
- Polish the GTK interface and layout
- Add scientific calculator functions
- Package it cleanly with README, screenshots, and instructions
- Start contributing to beginner open-source C projects
📣 I'd Love Your Feedback!
If you’re a C dev, GTK user, or just exploring programming, I’d love to hear your thoughts and suggestions. Feel free to drop a comment or check out my GitHub!
🔗 Connect with Me
- GitHub: logicCrafter320
- Reddit: [u/logicCrafter320](https://www.reddit.com/user/Shoddy_Economy_1646/
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