Simple Calculator

HTML:

• The HTML structure defines the basic layout and elements of the calculator.

• The <title> tag sets the title of the web page to "Calculator".

• The CSS styles are embedded within the <style> block, defining the appearance of the calculator.

CSS:

• CSS is used to style the calculator and its components.

• The styles define the font family, margin, padding, borders, and background colors of various elements.

• The calculator is styled to have a centered title, a specific width, and a border with rounded corners.

• The display area is styled with a margin, padding, and a border.

• The buttons are arranged in a grid layout using the display: grid property.

JavaScript:

• JavaScript adds interactivity and functionality to the calculator.

• The resultElement variable is assigned the HTML element with the id "result". It represents the display area where the result is shown.

• The appendToResult(value) function is called when a button is clicked. It appends the clicked button's value to the display area by modifying the textContent property of the resultElement.

• The clearResult() function clears the content of the display area by setting its textContent to an empty string.

• The calculateResult() function is called when the "=" button is clicked. It evaluates the mathematical expression entered in the display area using the eval() function. The result is stored in the result variable and displayed in the display area by modifying its textContent. If an error occurs during evaluation, such as dividing by zero or an invalid expression, the display area shows "Error" instead.

The HTML code includes a <h1> tag for the title, a <div> element with the class "calculator" that contains the calculator's components, and a <div> element with the class "buttons" for the button grid.

Inside the <div class="buttons"> element, there are buttons for numbers, operators, and special characters. Each button has an onclick attribute that calls the corresponding JavaScript functions (appendToResult(), clearResult(), and calculateResult()).

When you open the HTML file in a web browser, you'll see the calculator interface with the title, display area, and buttons. Clicking the buttons will update the display area, perform calculations, and show the result.