Calculator with Stack

Calculator with Stack is a simple C program that acts as a calculator with support for storing operations in a stack structure (Last-In-First-Out). Users can perform basic arithmetic operations, undo the last operation, view the full history, and reset the calculator.

Features

• Perform basic operations: +, -, *, /
• Stores each operation and result in a fixed-size stack
• Undo (pop) the last operation
• View all stored operations (stack history)
• Reset (clear) all operations

Installation

No installation is required. You can compile and run the program using a standard C compiler like gcc.

Compile

gcc -o calcstack calcstack.c

Run

./calcstack

Usage

Once compiled and running, the program provides a text-based menu:

----- Main menu -----
1. Operate
2. Show all operations.
3. Undo last operation.
4. Clear all.
5. Exit

Example

Insert the first number: 5
Insert the second number: 2
Select the operation (+ - * /): *
5.00 * 2.00 = 10.00

You can then view or undo this operation from the menu.

Code Structure

• Operation: Struct to hold a single calculation.
• History: Struct to manage a stack of operations.
• Core functions:
  • initialize(): Initializes or clears the history.
  • push(): Adds an operation to the stack.
  • pop(): Removes the last operation.
  • peek(): Views the last operation without removing.
  • isEmpty(): Checks if the stack is empty.
  • operate(): Handles user input and performs calculations.
  • showAll(): Displays all stored operations.
  • clearInputBuffer(): Cleans up invalid input from stdin.

Contributing

Pull requests are welcome. If you’d like to improve the functionality (e.g., support for more operations, dynamic stack resizing, file save/load), feel free to fork the repo and submit a PR.

Please open an issue to discuss any major changes before implementation.

License

MIT