Smart Calculation v1.0

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

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:

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:

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.

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:

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

7. Overpayment - overpayment on the loan.

8. 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: