Calculator Service

A simple calculator service built with Spring Boot, featuring basic arithmetic operations and persistence using JPA and an H2 in-memory database. The service provides RESTFUL endpoints to perform calculations and retrieve the history of operations.

Features

• Arithmetic Operations: Perform addition, subtraction, multiplication, and division.
• History Tracking: Retrieve the history of all calculations performed.
• In-Memory Database: Uses H2 database for storing calculation history.
• Spring Boot: Utilizes Spring Boot for rapid development and ease of use.

Technologies Used

• Spring Boot: Framework for building the RESTFUL service.
• Spring Data JPA: Data access layer using JPA.
• H2 Database: In-memory database for development and testing.
• JUnit: Testing framework for unit tests.

Class Diagram

API Endpoints

Example Request for Add:

curl -X GET "http://localhost:8080/api/calculator/add?a=5&b=3"

Example Response:

{
  "id": 1,
  "operation": "add",
  "operand1": 5,
  "operand2": 3,
  "result": 8
}

Example Request for Subtract:

curl -X GET "http://localhost:8080/api/calculator/subtract?a=5&b=3"

Example Response:

{
  "id": 2,
  "operation": "subtract",
  "operand1": 5,
  "operand2": 3,
  "result": 2
}

Example Request for Multiply:

curl -X GET "http://localhost:8080/api/calculator/multiply?a=5&b=3"

Example Response:

{
  "id": 3,
  "operation": "multiply",
  "operand1": 5,
  "operand2": 3,
  "result": 15
}

Example Request for Divide:

curl -X GET "http://localhost:8080/api/calculator/divide?a=6&b=3"

Example Response:

{
  "id": 4,
  "operation": "divide",
  "operand1": 6,
  "operand2": 3,
  "result": 2
}

History:

curl -X GET "http://localhost:8080/api/calculator/history"

Example Response:

[
  {
    "id": 1,
    "operation": "add",
    "operand1": 5,
    "operand2": 3,
    "result": 8
  },
  {
    "id": 2,
    "operation": "subtract",
    "operand1": 5,
    "operand2": 3,
    "result": 2
  }
  // Additional calculations...
]

Setup and Installation

Prerequisites

• Java 17
• Maven

Clone the Repository

git clone https://github.com/anasabbdelrahman/Calculator.git
cd Calculator