SmartCalc v3.0 (Individual project)

Implementation of SmartCalc v3.0 in Python (desktop application).

The app was developed in Python 3.11 using MVVM pattern. The model is a library in C++ from the previous version (SmartCalc v2.0) with a wrapper in Python. The view (frontend) was developed using Qt 6.5.2 (Python).

The installer uses Qt Installer Framework. Was tested with Linux and Windows.

App images

Installer images

Score:

The final score is 115% (max, without bonus part3).

Task

Part 1. SmartCalc v3.0 implementation

• The program must be developed in Python 3.11
• Prepare the installer, which will install the application to the system with the standard settings (installation path, creating shortcut)
• Prepare an implementation with a graphical user interface for either Linux or Mac OS, based on any GUI library or framework (GUI layer implementation in HTML/CSS/JS is acceptable)
• The program must be implemented using the MVVM or MVP pattern, and
  • there should be no business logic code in the view code
  • there must be no interface code in the model, presenter and view model
• The "core" of the calculator in the form of an algorithm for the formation and calculation of the Polish notation and various computational functions connect as a dynamic library in C/C++ from the SmartCalc v1.0 or SmartCalc v2.0 projects
• The model should be a "core" with a wrapper in Python
• The model must have all the calculator's functionality so that it can be used in the future without the other layers
• Prepare full coverage of methods in the model layer with unit tests
• The application should have a help section with a description of the program interface in random form
• The program must save the history of operations, allow loading expressions from the history and clear the entire history
• History must be saved between runs of the application
• Both integers and real numbers, written either via a point or in exponential form, can be input to the program
• Calculation should be performed after the complete entry of the calculated expression and pressing the symbol =
• Calculation of arbitrary bracketed arithmetic expressions in infix notation
• Calculation of arbitrary bracketed arithmetic expressions in infix notation with substitution of x variable as a number
• Plotting a function defined using an expression in infix notation with the variable x (with coordinate axes, scale marker, and grid with adaptive step)
  • It is not necessary to provide the user with the ability to change the scale
• The range of definition and the range of value of the functions are at least limited to numbers from -1000000 to 1000000
• To plot a function it is necessary to additionally specify the displayed area of definition and area of value
• Checked accuracy of the fractional part is at least 7 decimal places
• The user must be able to enter up to 255 characters
• Bracketed arithmetic expressions in infix notation must support the following arithmetic operations and mathematical functions:

  • Arithmetic operators:

    Operator name	Infix Notation (Classic)	Prefix notation (Polish notation)	Postfix notation (Reverse Polish notation)
    Parentheses	(a + b)	(+ a b)	a b +
    Addition	a + b	+ a b	a b +
    Subtraction	a - b	- a b	a b -
    Multiplication	a * b	* a b	a b *
    Division	a / b	/ a b	a b \
    Rasing to the power	a ^ b	^ a b	a b ^
    Remainder of division	a mod b	mod a b	a b mod
    Unary plus	+a	+a	a+
    Unary minus	-a	-a	a-

    Please note that the multiplication operator contains a mandatory * sign. Processing an expression with the * sign omitted is optional and left to the developer's discretion

    Function description	Function
    Calculates cosine	cos(x)
    Calculates sine	sin(x)
    Calculates tangent	tan(x)
    Calculates arc cosine	acos(x)
    Calculates the arcsine	asin(x)
    Calculates arctangent	atan(x)
    Calculates square root	sqrt(x)
    Calculates natural logarithm	ln(x)
    Calculates decimal logarithm	log(x)

Part 2. Bonus. Loan сalculator

Provide a special mode "loan calculator" (you can take websites like banki.ru and calcus.ru as an example):

• Input: total loan amount, term, interest rate, type (annuity, differentiated)
• Output: monthly payment, overpayment for the loan, total repayment

Part 3. Bonus. Deposit calculator

Provide a special mode "deposit calculator" (you can take websites like banki.ru and calcus.ru as an example):

• Input: deposit amount, deposit term, interest rate, tax rate, periodicity of payments, capitalization of interest, list of additions, list of partial withdrawals
• Output: accrued interest, tax amount, amount on deposit by the end of the term

Part 4. Bonus. Configuration and logging

Add settings to the app:

• Add reading of settings from configuration file when the program runs
• Include in the configuration file 3 or more parameters to choose from, such as background color, font size, etc.
• Add descriptions of editable parameters to help

Add logging to the application:

• Store operation history in logs
• Save logs in the logs folder, one file per rotation period
• It should be possible to set the period of logs rotation (hour/day/month)
• Files must be named according to the following pattern: logs_dd-MM-yy-hh-mm-ss ( the time of file creation )

Part 5. Bonus. Cross-platform

Make your app cross-platform:

• Add support Linux, Mac and Windows
• The installer should also be available for Linux, Mac and Windows (several different installers are allowed)