Smart Calculator

A basic python REPL application to calculate simple mathematical equation

Architecture

The App is divided into:

1. The main interface
2. The Validator, to validate the inputs
3. The Tokenizer, to transform validated inputs into list of tokens
4. The Calculator, to calculate tokenize equation into digit
5. The Command, to call the built in commands from inputs
6. The Exception, to represent custom errors
7. The Variable to represent a variable
8. The Digit to represent the numeric operands
9. The Operator to represent the Operator
10. The Memory to represent as a store for numeric value of Variable

Feature

1. Store and use variables in your equation!
2. Parenthesis, Multiplication, Division, Exponentiation, Addition, Subtraction and Assignment!
3. Stuck? use help! (/help)

How it works

python calculator/calculator.py

> 8 * 3 + 12 * (4 - 2)
48
> 2 - 2 + 3
3
> 4 * (2 + 3
Invalid expression
> -10
-10
> a=4
> b=5
> c=6
> a*2+b*3+c*(2+3)
53
> 1 +++ 2 * 3 -- 4
11
> 3 *** 5
Invalid expression
> 4+3)
Invalid expression
> /command
Unknown command
> /exit
Bye!

Requirements

Tested to work and run properly on python 3.8.5