Calculator
HTML
<!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 class="btn" id="clear">AC</button>
<button class="btn operator" id="modulo">%</button>
<button class="btn operator" id="square">x²</button>
<button class="btn operator" id="divide">/</button>
<button class="btn" id="seven">7</button>
<button class="btn" id="eight">8</button>
<button class="btn" id="nine">9</button>
<button class="btn operator" id="multiply">*</button>
<button class="btn" id="four">4</button>
<button class="btn" id="five">5</button>
<button class="btn" id="six">6</button>
<button class="btn operator" id="subtract">-</button>
<button class="btn" id="one">1</button>
<button class="btn" id="two">2</button>
<button class="btn" id="three">3</button>
<button class="btn operator" id="add">+</button>
<button class="btn" id="zero">0</button>
<button class="btn" id="decimal">.</button>
<button class="btn" id="equals">=</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
CSS
body {
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #f0f0f0;
font-family: Arial, sans-serif;
}
.calculator {
width: 300px;
background-color: #fff;
padding: 20px;
border-radius: 10px;
box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}
.display {
width: 100%;
height: 60px;
background-color: #333;
color: white;
text-align: right;
font-size: 2em;
line-height: 60px;
padding: 0 10px;
border-radius: 5px;
margin-bottom: 20px;
overflow: hidden;
}
.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-gap: 10px;
}
.btn {
width: 100%;
height: 60px;
background-color: #f9f9f9;
border: none;
font-size: 1.5em;
border-radius: 5px;
cursor: pointer;
transition: background-color 0.3s;
}
.btn:hover {
background-color: #e0e0e0;
}
.operator {
background-color: #ff9f43;
color: white;
}
.operator:hover {
background-color: #ff7f00;
}
JAVASCRIPT
const display = document.getElementById('display');
let currentInput = '';
let previousInput = '';
let operator = '';
function updateDisplay(value) {
display.innerText = value;
}
function clearDisplay() {
currentInput = '';
previousInput = '';
operator = '';
updateDisplay('0');
}
function calculate() {
let result = 0;
const num1 = parseFloat(previousInput);
const num2 = parseFloat(currentInput);
switch (operator) {
case '+':
result = num1 + num2;
break;
case '-':
result = num1 - num2;
break;
case '*':
result = num1 * num2;
break;
case '/':
result = num1 / num2;
break;
case '%':
result = num1 % num2;
break;
case 'x²':
result = num1 ** 2;
break;
default:
return;
}
currentInput = result.toString();
updateDisplay(currentInput);
previousInput = '';
operator = '';
}
document.querySelectorAll('.btn').forEach(button => {
button.addEventListener('click', () => {
const value = button.innerText;
if (!isNaN(value) || value === '.') {
currentInput += value;
updateDisplay(currentInput);
} else if (value === 'AC') {
clearDisplay();
} else if (value === '=') {
if (previousInput !== '' && operator !== '') {
calculate();
}
} else if (value === 'x²') {
operator = value;
previousInput = currentInput;
currentInput = '';
calculate();
} else {
if (previousInput === '') {
previousInput = currentInput;
} else if (currentInput !== '') {
calculate();
}
operator = value;
currentInput = '';
}
});
});
