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<html>
<head>
<script>
function calculate() {
var num1 = parseFloat(document.getElementById("num1").value);
var num2 = parseFloat(document.getElementById("num2").value);
var operator = document.getElementById("operator").value;
var result;
if (operator == "+") {
result = num1 + num2;
} else if (operator == "-") {
result = num1 - num2;
} else if (operator == "*") {
result = num1 * num2;
} else if (operator == "/") {
result = num1 / num2;
}
document.getElementById("result").value = result;
}
</script>
</head>
<body>
<input type="text" id="num1">
<select id="operator">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type="text" id="num2">
<button onclick="calculate()">Calculate</button>
<br><br>
Result: <input type="text" id="result">
</body>
</html>