Scientific Calculator

An interactive command-line scientific calculator written in Python. It presents a numbered menu, reads your inputs, and prints results for each operation. The core math lives in small functions in calculator.py, so you can also import them from another script if you want to reuse the same behavior.

What it does

• Runs a REPL-style loop: choose an operation, enter operands, see Result: …, repeat until you exit.
• Uses only the Python standard library (math); no extra packages to install.
• Validates some edge cases: division by zero and logarithms of non-positive numbers raise clear errors instead of failing silently.

Operations

Choice	Operation	Inputs	Notes
1	Add	x, y
2	Subtract	x, y
3	Multiply	x, y
4	Divide	x, y	Error if y is zero
5	Sine	x	x is in radians
6	Cosine	x	radians
7	Tangent	x	radians
8	Logarithm	x, optional base	x must be > 0; base defaults to e if you press Enter
9	Exponent	x, y	x to the power y (math.pow)
0	Exit	—	Ends the program

Invalid menu choices print Invalid choice. Other problems (bad numeric input, domain errors) print Error: … with the exception message.

Requirements

• Python 3 (any recent 3.x is fine)

Usage

From the project directory:

python calculator.py

Follow the on-screen prompts. For logarithms, leave the base blank to use the natural logarithm (base e).

Project layout

• calculator.py — Menu-driven main() plus the operation functions (add, subtract, multiply, divide, sine, cosine, tangent, logarithm, exponent).

Disclaimer

For learning purposes.