<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculator</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="calculator">
<div class="display" id="display">0</div>
<div class="buttons">
<button onclick="clearAll()">AC</button>
<button onclick="clearLast()">Del</button>
<button class="double-width" onclick="calculate()">=</button>
<button onclick="appendNumber('1')">1</button>
<button onclick="appendNumber('2')">2</button>
<button onclick="appendNumber('3')">3</button>
<button onclick="operate('add')">+</button>
<button onclick="appendNumber('4')">4</button>
<button onclick="appendNumber('5')">5</button>
<button onclick="appendNumber('6')">6</button>
<button onclick="operate('subtract')">-</button>
<button onclick="appendNumber('7')">7</button>
<button onclick="appendNumber('8')">8</button>
<button onclick="appendNumber('9')">9</button>
<button onclick="operate('multiply')">*</button>
<button onclick="operate('divide')">/</button>
<button onclick="appendNumber('0')">0</button>
<button onclick="appendNumber('.')">.</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
let currentInput = '0';
let operator = null;
let previousInput = null;
let shouldResetDisplay = false;
function clearAll() {
currentInput = '0';
operator = null;
previousInput = null;
shouldResetDisplay = false;
updateDisplay();
}
function clearLast() {
currentInput = currentInput.slice(0, -1);
if (currentInput === '') {
currentInput = '0';
}
updateDisplay();
}
function appendNumber(number) {
if (shouldResetDisplay) {
currentInput = number;
shouldResetDisplay = false;
} else {
currentInput = currentInput === '0' ? number : currentInput + number;
}
updateDisplay();
}
function operate(op) {
if (operator !== null) {
calculate();
}
previousInput = currentInput;
operator = op;
shouldResetDisplay = true;
updateDisplay();
}
function calculate() {
let result;
const prev = parseFloat(previousInput);
const current = parseFloat(currentInput);
if (isNaN(prev) || isNaN(current)) return;
switch (operator) {
case 'add':
result = prev + current;
break;
case 'subtract':
result = prev - current;
break;
case 'multiply':
result = prev * current;
break;
case 'divide':
result = prev / current;
break;
default:
return;
}
currentInput = result.toString();
operator = null;
previousInput = null;
shouldResetDisplay = true;
updateDisplay();
}
function updateDisplay() {
const display = document.getElementById('display');
if (operator && !shouldResetDisplay) {
display.innerText = `${previousInput} ${getOperatorSymbol(operator)} ${currentInput}`;
} else {
display.innerText = currentInput;
}
}
function getOperatorSymbol(op) {
switch (op) {
case 'add':
return '+';
case 'subtract':
return '-';
case 'multiply':
return '*';
case 'divide':
return '/';
default:
return '';
}
}
styles.css
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background: url('your-background-image.jpg') no-repeat center center fixed;
background-size: cover;
position: relative;
}
body::before {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5); /* Adjust the opacity as needed */
z-index: 0;
}
.calculator {
border: 1px solid #ccc;
border-radius: 10px;
box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
width: 320px;
background-color: #fff;
position: relative;
z-index: 1;
}
.display {
background-color: #222;
color: #fff;
font-size: 2em;
text-align: right;
padding: 20px;
border-top-left-radius: 10px;
border-top-right-radius: 10px;
}
.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
}
button {
padding: 20px;
font-size: 1.5em;
border: 1px solid #ccc;
background-color: #f9f9f9;
cursor: pointer;
z-index: 1;
}
button:hover {
background-color: #eaeaea;
}
button:active {
background-color: #ccc;
}
button:nth-child(4n) {
background-color: #ff9500;
color: #fff;
}
button:nth-child(4n):hover {
background-color: #e18b00;
}
button:nth-child(4n):active {
background-color: #c77c00;
}
.buttons .double-width{
flex-grow: 2;;
}