A feature-rich, colorful command-line calculator with multiple operation modes, scientific functions, and an intuitive user interface.

• Trigonometric: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh
• Mathematical: sqrt, cbrt, factorial, abs, ceil, floor, round
• Logarithmic: log, log10, log2, exp
• Constants: pi, e

• Basic Mode - Simple numbered operations (addition, subtraction, multiplication, division, exponentiation).
• Expression Mode - Direct mathematical expression input with complex calculations.
• Scientific Mode - Advanced functions and constants with comprehensive help system.

• Colorized terminal output with beautiful ASCII art banners.
• Color-coded results (green for results, red for errors, cyan for prompts).
• Clean input/output formatting for enhanced readability.
• Structured operation menus for easy navigation.

• Calculation history with storage and viewing capabilities.
• Settings management: degree/radian mode toggle, scientific notation toggle.
• Enhanced error handling with descriptive error messages.
• Complex expression evaluation with safety checks.
• Parentheses balancing validation for mathematical expressions.
• Demo mode to showcase calculator capabilities.
• Built-in help system with function descriptions and examples.
• Screen clearing and history management.

• Input validation for numeric values.
• Expression syntax validation.
• Safe evaluation using restricted eval with allowed functions only.
• Comprehensive error handling for division by zero, invalid inputs, and syntax errors.

• Python 3.6 (or) higher.
• Terminal/Command Prompt with ANSI color support (most modern terminals).

1. Download the calculator:

   # Clone or download the CalcPro.py file.
   wget -L https://raw.githubusercontent.com/Nullkernel/CalcPro/main/CalcPro.py
   # or simply copy the CalcPro.py file to your desired directory.

2. Make it executable (optional, for Unix-based systems):

   chmod +x CalcPro.py

python CalcPro.py

or

python3 CalcPro.py

Choose from numbered options:

• [1] Addition
• [2] Subtraction
• [3] Multiplication
• [4] Division
• [5] Exponentiation

# Basic arithmetic
Calculator> 3 + 5 * 2
# Scientific functions
Calculator> sqrt(16) + 2^3
# Trigonometric (respects angle mode)
Calculator> sin(90) + cos(0)
# Logarithmic
Calculator> log10(100) + log(e)
# Complex expressions
Calculator> (2 + 3) * sqrt(25) / factorial(3)

# Trigonometric functions:
sin(angle), cos(angle), tan(angle),
asin(x), acos(x), atan(x),
sinh(x), cosh(x), tanh(x)
# Mathematical functions: 
sqrt(x), cbrt(x), factorial(n),
abs(x), ceil(x), floor(x), round(x)
# Logarithmic functions:
log(x), log10(x), log2(x), exp(x)
# Constants:
pi, e
# Power operations:
pow(x,y), x^y, x**y

• Radians (default): For mathematical calculations
• Degrees: For practical applications
• Toggle with m command

• OFF (default): Standard decimal notation
• ON: Scientific notation (e.g., 1.234567e+02)
• Toggle with s command

Calculator> 1
# Enter First Number: 15
# Enter Second Number: 25
# Result: 15.0 + 25.0 = 40
Calculator> 2 + 3 * 4
# Result: 14

Calculator> sqrt(144)
# Result: 12
Calculator> sin(90) # (in degree mode)
# Result: 1
Calculator> log10(1000)
# Result: 3
Calculator> factorial(5)
# Result: 120

Calculator> (sqrt(16) + 2^3) / factorial(3)
# Result: 2
Calculator> pi * 2
# Result: 6.283185307179586

The calculator provides comprehensive error handling for:

• Invalid numeric input: Clear error messages for non-numeric values.
• Division by zero: Prevents mathematical errors.
• Syntax errors: Validates mathematical expression syntax.
• Unmatched parentheses: Ensures proper expression structure.
• Unknown functions: Helpful suggestions for valid function names.
• Factorial of negative numbers: Mathematical domain validation.

• Colorful ASCII art banner on startup
• Color-coded output:
  • Green: Results and success messages.
  • Red: Error messages.
  • Blue: Section headers.
  • Yellow: Input prompts and warnings.
  • Cyan: Options and commands.

1. Start the calculator: python CalcPro.py
2. Try a simple calculation: Enter 2 + 3
3. Explore scientific functions: Enter sqrt(25)
4. Check history: Enter h
5. Get help: Enter ?
6. Try demo mode: Enter demo

This calculator is designed to be extensible. You can easily add new functions by:

1. Adding the function to the allowed_names dictionary in evaluate_expression().
2. Adding documentation to the suggestions dictionary.
3. Implementing any custom mathematical functions as needed.

This project is open source and available under standard GNU General Public License v3.0 licensing terms.

If you encounter any issues:

1. Check that you're using Python 3.6 (or) higher.
2. Ensure your terminal supports ANSI color codes.
3. Verify that mathematical expressions follow standard notation.
4. Use the ? command for function help
5. Try the demo command to see example usage

Happy Calculating!