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https://github.com/4s4v1n/smart-calculation-v1.0

Calculator implementation with gui.
https://github.com/4s4v1n/smart-calculation-v1.0

calculator cpp gui gui-application math

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Calculator implementation with gui.

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README 

        
# Smart Calculation v1.0



![preview](images/calc_preview.png)



## Content

This project implements a calculator with a graphical interface. It supports both standard mathematical operations and the calculation of some elementary functions, the construction of graphs of functions, the calculation of the value of a function at a specific point, and a loan calculator. For calculations, the calculator uses the reverse Polish notation algorithm, while all graphics are written in Qt.

Appearance of the calculator

![start](images/start.png)



## Basic Calculator

The main page contains numbers, operations, functions, constants, special characters and 'x'.

The numbers `0-9` are responsible for entering the corresponding number.

The constant `π` is defined as 3.14, `e` as 2.72 .



`AC` - erases the entire input string, `←` - deletes the last character in the input string, `√` - square root function.

All operations are intuitive.

Correct input is required, namely:



1) The number of opening and closing brackets is the same. `(2+3)*2` - correct notation, `((2+3)*2` - incorrect notation.

2) The arguments of all functions are indicated in brackets. `sin(x)` is valid, `sinx` is invalid.

3) There are no unintended literals in the expression record.

Work example:



![Main](./images/standart.gif)



## Graphs of function and value at point

In addition to calculating standard mathematical expressions, this calculator supports plotting functions and calculating the value of a function at a certain point.

You can plot or calculate the value of a function if you have `x` in the input string.1) When calculating a value at a function point, you will be prompted to enter it, a value will be substituted in place of `x` and the calculation will be performed.

2) When plotting a function, you will be prompted to specify the domain of the function and the range of values. In the future, the resulting graph can be scaled and moved.

Examples:



![graph](./images/graph.gif)

![other_graph](./images/other_graph.gif)



## Credit calculator

Additionally, the implementation of a loan calculator is presented, similar to most online loan calculators.

To select it, switch the calculator's mode to the status bar.



![credit_png](./images/credit.png)

Input data:



1) `Credit sum` - loan amount, in any currency.

2) `Credit term` - credit term - numerically.

3) `Term type` - term type, namely months or years.

4) `Percent` - percentage per annum on the loan.

5) `Monthly payment type` - payment type, namely authentic or differential.

Output:



1) `Monthly payment` - monthly payment on the loan (in the case of differential payments, the amount for the first and last months is indicated).

2) `Overpayment` - overpayment on the loan.

3) `Full payment` - the total payment on the loan.

After entering the data, you must click on the `calculate` button - then the calculations will be made.

Work example:



![credit_gif](./images/credit.gif)