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<! DOCTYPE html> <html> <head> <title>Factorial Calculator</title> <script> // Function to compute the factorial of a number function calculateFactorial() { var num = parseInt(document.getElementById("number").value); var factorial = 1; if (num >= 0) { for (var i = 1; i <= num; i++) { factorial *= i; } alert("Factorial of " + num + " is: " + factorial); } else { alert("Please enter a non-negative number!"); } } </script> </head> <body> <h1>Factorial Calculator</h1> <label for="number">Enter a number:</label> <input type="number" id="number"><br> <button onclick="calculateFactorial()">Calculate Factorial</button> </body> </html>
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