Online JavaScript Calculator: Perform Mathematical Operations
Calculator in JavaScript
JavaScript is a versatile programming language that can be used to create a wide variety of web applications, including calculators. A simple calculator application can be designed using JavaScript to perform basic arithmetic operations such as addition, subtraction, multiplication, and division.
To design a simple calculator application in JavaScript, we will need to use the following steps:
- Create an HTML file. The HTML file will contain the basic structure of the calculator, such as the input field, buttons, and output field.
- Add a CSS file. The CSS file will be used to style the calculator and make it look more appealing.
- Add a JavaScript file. The JavaScript file will contain the code to perform the calculations and update the output field.
Example of a simple calculator application in JavaScript:
<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h1>Calculator</h1>
<input type="text" id="display" value="0">
<button type="button" id="7">7</button>
<button type="button" id="8">8</button>
<button type="button" id="9">9</button>
<button type="button" id="/">/</button>
<button type="button" id="4">4</button>
<button type="button" id="5">5</button>
<button type="button" id="6">6</button>
<button type="button" id="*">*</button>
<button type="button" id="1">1</button>
<button type="button" id="2">2</button>
<button type="button" id="3">3</button>
<button type="button" id="-">-</button>
<button type="button" id="0">0</button>
<button type="button" id=".">.</button>
<button type="button" id="=">=</button>
<button type="button" id="c">C</button>
<script src="script.js"></script>
</body>
</html>body {
font-family: sans-serif;
}
#display {
width: 200px;
height: 50px;
font-size: 20px;
text-align: right;
}
button {
width: 50px;
height: 50px;
font-size: 20px;
}// Get the display element.
const display = document.getElementById('display');
// Add event listeners to the buttons.
document.querySelectorAll('button').forEach(button => {
button.addEventListener('click', () => {
// Update the display element with the button's text.
display.value += button.textContent;
});
});
// Add an event listener to the equal button.
document.getElementById('=').addEventListener('click', () => {
// Evaluate the expression in the display element and update the output.
display.value = eval(display.value);
});
// Add an event listener to the clear button.
document.getElementById('c').addEventListener('click', () => {
// Clear the display element.
display.value = '';
});This is just a basic example of a calculator application in JavaScript. You can add more features, such as support for more complex mathematical operations, or create a more user-friendly interface.
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