Preview:
Approach:
Example :
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>HTML Calculator</title>
<style>
body {
font-family: Arial, sans-serif;
}
.calculator {
width: 300px;
margin: 0 auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 5px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
text-align: center;
}
input[type="text"] {
width: 100%;
margin-bottom: 10px;
padding: 10px;
font-size: 18px;
border: 1px solid #ccc;
border-radius: 5px;
box-sizing: border-box;
}
.btn {
width: 50px;
height: 50px;
margin: 5px;
font-size: 18px;
border: none;
border-radius: 5px;
cursor: pointer;
}
.btn.operator {
background-color: #f0ad4e;
}
.btn.clear {
background-color: #d9534f;
}
.btn.equal {
background-color: #5cb85c;
}
</style>
</head>
<body>
<div class="calculator">
<input type="text" id="result" readonly>
<div>
<button class="btn" onclick="addToScreen('7')">7</button>
<button class="btn" onclick="addToScreen('8')">8</button>
<button class="btn" onclick="addToScreen('9')">9</button>
<button class="btn operator" onclick="addToScreen('+')">+</button>
</div>
<div>
<button class="btn" onclick="addToScreen('4')">4</button>
<button class="btn" onclick="addToScreen('5')">5</button>
<button class="btn" onclick="addToScreen('6')">6</button>
<button class="btn operator" onclick="addToScreen('-')">-</button>
</div>
<div>
<button class="btn" onclick="addToScreen('1')">1</button>
<button class="btn" onclick="addToScreen('2')">2</button>
<button class="btn" onclick="addToScreen('3')">3</button>
<button class="btn operator" onclick="addToScreen('*')">*</button>
</div>
<div>
<button class="btn clear" onclick="clearScreen()">C</button>
<button class="btn" onclick="addToScreen('0')">0</button>
<button class="btn operator" onclick="calculate()">=</button>
<button class="btn operator" onclick="addToScreen('/')">/</button>
</div>
</div>
<script>
function addToScreen(value) {
document.getElementById('result').value += value;
}
function clearScreen() {
document.getElementById('result').value = '';
}
function calculate() {
let result = document.getElementById('result').value;
try {
document.getElementById('result').value = eval(result);
} catch (error) {
document.getElementById('result').value = 'Error';
}
}
</script>
</body>
</html>
This HTML calculator provides a simple interface for performing basic arithmetic calculations. Users can input numbers and operators using the buttons provided and the result will be displayed in the input field.
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