Advanced CLI Calculator (C Project)

A modular C command-line calculator supporting arithmetic, scientific functions, and robust error handling — perfect for learning C and CLI programming.

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🖥️ Screenshot

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✨ Features

• Binary operations: +, -, *, /, % (remainder), ** (power)
• Unary operations: sqrt, log, ln, abs, cos, sin, tan, exp
• Trigonometric inputs in degrees (converted internally to radians)
• Error handling with exit codes for invalid input, divide by zero, domain errors
• Smart output formatting (integers vs floats)
• Modular design for easy extension

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🖥️ Usage

# Binary (two operands)
./cli-calculator 10 + 5        # 15
./cli-calculator 2 ** 3        # 8
./cli-calculator 7 / 2         # 3.5

# Unary (single operand)
./cli-calculator sqrt 25       # 5
./cli-calculator log 1000      # 3
./cli-calculator cos 60        # 0.5

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🛠️ Build

You can compile the project using either method:

# Using gcc directly
gcc -std=c11 -O2 -Wall -Wextra -lm -o cli-calculator calculator.c

# Or, if using the CS50 environment
make cli-calculator

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🚀 Exit Codes

0 – Success

1 – Invalid number of arguments

2 – Invalid operator or operation

3 – Division or modulo by zero

4 – Invalid number format

5 – Square root of negative number

6 – Log10 of non-positive number

7 – Natural log of non-positive number

8 – Tangent undefined (e.g., 90°, 270°, …)

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📄 License

This project is licensed under the MIT License. See the LICENSE file for details.