math-app_TECH

This project implements a Java CLI app for calculating the roots of expressions.
Users can enter mathematical expressions, calculate their roots, and store the results in a database.
The program also validates the correctness of the entered expressions before calculating.

Table of Contents

• Technologies
• Installation
• Usage

Technologies

The project uses the following technologies:

• Java 17
• Jeval (for evaluating expressions)
• JDBC (for connecting to DB, executing queries and retrieving data)
• PostgreSQL (as the relational database management system)
• Maven (for dependency management)
• Git (for version control)

Installation

To run the project locally, follow these steps:

1. Clone the repository:

   git clone https://github.com/YaremaMaksym/math-app_TECH.git
   

2. Open the project in your preferred IDE.

3. Set up the database:

• Install and configure PostgreSQL on your system.
• Update the DBConnectionManager class with your PostgreSQL credentials.
• Create a new database named math_app.
• Create tables:

CREATE TABLE expressions (
    id serial PRIMARY KEY,
    expression text
);

CREATE TABLE roots (
    id serial PRIMARY KEY,
    expression_id integer REFERENCES expressions(id),
    value double precision
);

4. Run the application

Usage

1. Run the Application: Start the application by running the main method of the Main class.

2. Enter Expressions and Roots:

• Choose option "1️⃣ - Enter expression Menu" to access the expression input menu.
• In the expression input menu, you can:
  • Enter a new expression that you want to enter roots for, the app will check if you have entered the correct expression and save it to the DB, if so.
  • Enter the roots for the current expression, and the app will check if you right, if so it will save root to the DB.
  • Exit to the main menu by selecting option "3️⃣ - Exit to main menu".

3. Find Expressions by Roots:

• Select option "2️⃣ - Find expressions by roots".
• Enter the roots separated by spaces.
• The app will display expressions that have the specified roots from DB.

4. Find Expressions with Single Root:

• Select option "3️⃣ - Find expressions with one root".
• The app will display expressions that have only one root from DB.

5. Exit the Application:

• Select option "4️⃣ - Exit" to exit the application.