SimpleCalculator.c

A beginner-friendly console-based calculator written in C. It performs basic arithmetic operations like addition, subtraction, multiplication, and division, and operates in a continuous loop until the user chooses to exit. This calculator does not follow BODMAS rules, meaning operations are performed in the order of input.

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Features

• Simple and interactive CLI calculator
• Supports:
  • Addition
  • Subtraction
  • Multiplication
  • Division
• Clear screen after every operation
• Continuous operations until manually exited
• Platform-independent screen clearing (Windows/Linux/macOS)
• Custom user prompts for better guidance

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Usage Instructions

1. Compile the program:

gcc SimpleCalculator.c -o SimpleCalculator.exe

2. Run the program:

./SimpleCalculator.exe

3. Follow on-screen prompts:

   • Enter the first number.
   • Choose an operation.
   • Enter the next number.
   • Repeat until you're done.
   • Press 5 to exit the program and display the final result.

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Notes

• The calculator executes operations sequentially; it does not apply precedence rules like BODMAS.
• Only valid numeric inputs should be provided.
• In case of invalid operator input, the program prompts the user again.

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Code Structure Overview

• clearScreen() – Clears the console screen depending on the operating system.
• chooseOperator() – Displays the operator menu.
• enterNumber() – Prompts user to enter a number.
• notValidOption() – Displays a message for invalid input and re-prompts.
• add(), subtract(), multiply(), division() – Functions to perform respective operations.

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Example

***** Welcome To SimpleCalculator.c *****

This Calculator not follows the rule of BODMAS <br/>
Developed By Kumar Sahil. GitHub- https://github.com/krsahil8825

----User Instruction----
1. Press '1' for addition
2. Press '2' for subtraction
3. Press '3' for multiplication
4. Press '4' for division
5. Press '5' for exit
-------Let's Start!-------

Enter a number: 10
Enter a operator: 1
Enter a number: 5
Current Result = 15.00
...
Result = 35.00
Created By Kumar Sahil.
GitHub - https://github.com/krsahil8825/SimpleCalculator.c
CopyRight (c) 2025 Kumar Sahil | All Rights Reserved.

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Contributing

Contributions and suggestions to improve this project are welcome. Feel free to fork the repository and submit pull requests.

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License

This project is licensed under the Apache License 2.0.

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Author

Originally created by Kumar Sahil (2025) | All rights reserved.

Read Notice before Using in Your Project Notice