Improved Mobile Calculator App
About this app
An improved sleek mobile calculator app with enhanced display and customized button styles.
Improved Mobile Calculator App C ( ) % / * - + 7 8 9 4 0 1 2 3 = .
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Source
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Improved Mobile Calculator App</title>
<meta name="description" content="An improved sleek mobile calculator app with enhanced display and customized button styles.">
<meta name="keywords" content="calculator, mobile app, math, mobile calculator, educational tool">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.min.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.6.0/css/fontawesome.min.css" crossorigin="anonymous">
<script type="text/javascript">
document.addEventListener("DOMContentLoaded", function () {
const btns = document.querySelectorAll('.calc-button');
const display = document.getElementById('display');
const errorDisplay = document.getElementById('error-display');
let currentInput = '';
btns.forEach(btn => {
btn.addEventListener('click', function () {
const value = btn.innerText;
if (value === '=') {
try {
const result = eval(currentInput);
display.innerText = result;
display.style.color = 'green'; // set result color to green
errorDisplay.innerText = ''; // clear error
} catch (e) {
errorDisplay.innerText = 'Error';
display.innerText = ''; // clear display on error
display.style.color = 'black'; // reset color on error
}
currentInput = ''; // reset input after calculation
} else if (value === 'C') {
currentInput = ''; // clear input
display.innerText = '';
errorDisplay.innerText = '';
display.style.color = 'black'; // reset color when cleared
} else {
currentInput += value; // append to input
display.innerText = currentInput; // update display
display.style.color = 'black'; // set display color to black
}
});
});
});
</script>
<style>
body {
background-color: white;
}
#main-container {
padding: 20px;
}
#display {
font-size: 2rem;
color: black;
background-color: white;
border: 1px solid black;
margin-bottom: 10px;
height: 50px;
display: flex;
align-items: center;
justify-content: flex-end;
padding-right: 10px;
border-radius: 5px;
}
.calc-button {
font-size: 1.5rem;
background-color: black;
color: white;
border: none;
margin: 5px;
border-radius: 5px;
padding: 15px;
width: 70px;
transition: background-color 0.3s;
}
.calc-button:hover {
background-color: gray;
}
#error-display {
color: red;
font-size: 1.5rem;
}
</style>
</head>
<body>
<div id="main-container" class="container">
<div id="display"></div>
<div id="error-display"></div>
<div class="d-flex flex-wrap">
<button class="calc-button">C</button>
<button class="calc-button">(</button>
<button class="calc-button">)</button>
<button class="calc-button">%</button>
<button class="calc-button">/</button>
<button class="calc-button">*</button>
<button class="calc-button">-</button>
<button class="calc-button">+</button>
<button class="calc-button">7</button>
<button class="calc-button">8</button>
<button class="calc-button">9</button>
<button class="calc-button">4</button>
<button class="calc-button">0</button>
<button class="calc-button">1</button>
<button class="calc-button">2</button>
<button class="calc-button">3</button>
<button class="calc-button">=</button>
<button class="calc-button">.</button>
</div>
</div>
</body>
</html>
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