JavaScript-based Calculator Application Description

This application is a web-based calculator built using JavaScript, HTML, and CSS. Users can perform arithmetic operations by clicking buttons on a web browser, and it provides an intuitive interface. The results of calculations are displayed in real-time on the screen, allowing users to continue performing calculations as desired.

This calculator uses HTML to create the structure of the screen, CSS for styling, and JavaScript to implement dynamic behaviors. Key features include number input, arithmetic operations, reset, and backspace functionality. The calculation process is designed to be intuitive.

• HTML Structure

  The HTML file defines the interface of the calculator, using div elements to build the layout.

  Main Container

  - div id="calculator": This serves as the overall container for the calculator.

  - div id="display": This is the area where user inputs and calculation results are displayed.

  Button Container

  - div class="buttons": This is the area containing number and operation buttons.

  - button class="number": These are number buttons (0-9) that, when clicked, add the corresponding number to the display.

  - button class="operator": These are operator buttons (+, -, *, /) that allow users to input arithmetic operators.

  - button id="clear": This button resets the display.

  - button id="delete": This button deletes the last character entered.

  - button id="equals": This button executes the operation and displays the result.

  The HTML structure defines the basic layout of the calculator, with each element linked to JavaScript to perform the necessary functions.

  
  

• JavaScript Functionality

  JavaScript code interacts with HTML elements to perform dynamic functions. Key functions are as follows:

  Input Handling (handleInput(value))

  - When the user clicks a button, the corresponding number or operator is added to the display. This function handles adding the entered value to the display area.

  Real-time Calculation (calculate())

  - When the user clicks the "=" button, the entered expression is evaluated and the result is displayed. The eval() function in JavaScript is used to perform the calculation, with exception handling added to display error messages for invalid inputs.

  Reset and Edit Functions

  - clearDisplay(): This function resets the display.

  - deleteLast(): This function deletes the last entered character.

  These features help users easily correct mistakes in case of incorrect input.

  
  

• Flexible Use

  This calculator is designed to allow users to freely manipulate inputs without any specific format restrictions. Numbers and operators can be entered in any desired order, and calculations can be performed repeatedly.

  Additionally, the design can be modified by editing HTML and CSS, and new functionalities can be added by extending the JavaScript code. For instance, features like trigonometric functions or logarithmic calculations can be incorporated.

  
  

• Summary

  This calculator is a web-based tool with basic functionality, created using HTML, CSS, and JavaScript. It supports various input methods and is structured intuitively, making it user-friendly. It can be further developed by adding more features, improving user convenience, and providing support for more advanced calculations. This could lead to more refined calculations and increased usability in the future.