decagondev/simple-calc.html

## simple-calc.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Calculator</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 400px;
            margin: 50px auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .calculator {
            background-color: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        h2 {
            margin-top: 0;
            color: #333;
        }
        label {
            display: block;
            margin-top: 15px;
            margin-bottom: 5px;
            color: #555;
            font-weight: bold;
        }
        select, input {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            box-sizing: border-box;
        }
        button {
            width: 100%;
            padding: 12px;
            margin-top: 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 16px;
            cursor: pointer;
            font-weight: bold;
        }
        button:hover {
            background-color: #45a049;
        }
        #result {
            margin-top: 20px;
            padding: 15px;
            background-color: #e8f5e9;
            border-radius: 4px;
            font-size: 18px;
            font-weight: bold;
            color: #2e7d32;
            text-align: center;
            min-height: 20px;
        }
    </style>
</head>
<body>
    <div class="calculator">
        <h2>Calculator</h2>

        <label for="operation">Operation:</label>
        <select id="operation">
            <option value="add">Add</option>
            <option value="subtract">Subtract</option>
            <option value="multiply">Multiply</option>
            <option value="divide">Divide</option>
        </select>

        <label for="op1">Number 1:</label>
        <input type="number" id="op1" step="any" placeholder="Enter first number">

        <label for="op2">Number 2:</label>
        <input type="number" id="op2" step="any" placeholder="Enter second number">

        <button onclick="calculate()">Calculate</button>

        <div id="result"></div>
    </div>

    <script>
        function add(a, b) {
            return a + b;
        }

        function subtract(a, b) {
            return a - b;
        }

        function multiply(a, b) {
            return a * b;
        }

        function divide(a, b) {
            if (b === 0) {
                return "Cannot divide by zero";
            }
            return a / b;
        }

        function calculate() {
            const operation = document.getElementById('operation').value;
            const op1 = parseFloat(document.getElementById('op1').value);
            const op2 = parseFloat(document.getElementById('op2').value);
            const resultDiv = document.getElementById('result');

            if (isNaN(op1) || isNaN(op2)) {
                resultDiv.textContent = "Please enter valid numbers";
                return;
            }

            let result;

            if (operation === 'add') {
                result = add(op1, op2);
            } else if (operation === 'subtract') {
                result = subtract(op1, op2);
            } else if (operation === 'multiply') {
                result = multiply(op1, op2);
            } else if (operation === 'divide') {
                result = divide(op1, op2);
            }

            resultDiv.textContent = "Result: " + result;
        }
    </script>
</body>
</html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Simple Calculator</title>
	<style>
	body {
	font-family: Arial, sans-serif;
	max-width: 400px;
	margin: 50px auto;
	padding: 20px;
	background-color: #f5f5f5;
	}
	.calculator {
	background-color: white;
	padding: 30px;
	border-radius: 8px;
	box-shadow: 0 2px 10px rgba(0,0,0,0.1);
	}
	h2 {
	margin-top: 0;
	color: #333;
	}
	label {
	display: block;
	margin-top: 15px;
	margin-bottom: 5px;
	color: #555;
	font-weight: bold;
	}
	select, input {
	width: 100%;
	padding: 10px;
	border: 1px solid #ddd;
	border-radius: 4px;
	font-size: 16px;
	box-sizing: border-box;
	}
	button {
	width: 100%;
	padding: 12px;
	margin-top: 20px;
	background-color: #4CAF50;
	color: white;
	border: none;
	border-radius: 4px;
	font-size: 16px;
	cursor: pointer;
	font-weight: bold;
	}
	button:hover {
	background-color: #45a049;
	}
	#result {
	margin-top: 20px;
	padding: 15px;
	background-color: #e8f5e9;
	border-radius: 4px;
	font-size: 18px;
	font-weight: bold;
	color: #2e7d32;
	text-align: center;
	min-height: 20px;
	}
	</style>
	</head>
	<body>
	<div class="calculator">
	<h2>Calculator</h2>

	<label for="operation">Operation:</label>
	<select id="operation">
	<option value="add">Add</option>
	<option value="subtract">Subtract</option>
	<option value="multiply">Multiply</option>
	<option value="divide">Divide</option>
	</select>

	<label for="op1">Number 1:</label>
	<input type="number" id="op1" step="any" placeholder="Enter first number">

	<label for="op2">Number 2:</label>
	<input type="number" id="op2" step="any" placeholder="Enter second number">

	<button onclick="calculate()">Calculate</button>

	<div id="result"></div>
	</div>

	<script>
	function add(a, b) {
	return a + b;
	}

	function subtract(a, b) {
	return a - b;
	}

	function multiply(a, b) {
	return a * b;
	}

	function divide(a, b) {
	if (b === 0) {
	return "Cannot divide by zero";
	}
	return a / b;
	}

	function calculate() {
	const operation = document.getElementById('operation').value;
	const op1 = parseFloat(document.getElementById('op1').value);
	const op2 = parseFloat(document.getElementById('op2').value);
	const resultDiv = document.getElementById('result');

	if (isNaN(op1) \|\| isNaN(op2)) {
	resultDiv.textContent = "Please enter valid numbers";
	return;
	}

	let result;

	if (operation === 'add') {
	result = add(op1, op2);
	} else if (operation === 'subtract') {
	result = subtract(op1, op2);
	} else if (operation === 'multiply') {
	result = multiply(op1, op2);
	} else if (operation === 'divide') {
	result = divide(op1, op2);
	}

	resultDiv.textContent = "Result: " + result;
	}
	</script>
	</body>
	</html>
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