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<!DOCTYPE html>
<html>
<head>
<title>Calculator</title>
</head>
<body>
<h1>Calculator</h1>
Number 1: <input type="text" id="num1" value="0"/><br/>
Number 2: <input type="text" id="num2" value="0"/><br/>
<button onclick="calculate()">Add</button><br/>
Result: <span id="resultArea"></span>
<script>
const addButton = document.getElementById("addButton");
const resultArea = document.getElementById("resultArea");
function calculate() {
// 1. Fetch values from the text fields using their IDs
let value1 = document.getElementById("num1").value;
let value2 = document.getElementById("num2").value;
// 2. Convert strings to floating-point numbers
let number1 = parseFloat(value1);
let number2 = parseFloat(value2);
// 3. Handle empty fields or invalid inputs (fallback to 0)
if (isNaN(number1)) number1 = 0;
if (isNaN(number2)) number2 = 0;
// 4. Perform math addition
let sum = number1 + number2;
// 5. Output the final sum to the page
resultArea.innerText = sum;
}
</script>
</body>
</html>
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