A simple program to ask the user to give a number and then the program will generate the Fibonacci sequence using JavaScript programming language.
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Program Listing<!DOCTYPE html> <html> <head> <title>Fibonacci Sequence in JavaScript</title> </head> <body> <h1>Fibonacci Sequence in JavaScript</h1> <p>Enter the number of Fibonacci numbers you want to generate:</p> <input type="number" id="numInput" min="1" value="10"> <button onclick="generateFibonacci()">Generate</button> <div id="fibOutput"></div> <script> function generateFibonacci() { const numInput = document.getElementById("numInput"); const fibOutput = document.getElementById("fibOutput"); const n = parseInt(numInput.value); if (isNaN(n) || n <= 0) { fibOutput.textContent = "Please enter a valid positive number."; return; } const sequence = fibonacci(n); fibOutput.textContent = `First ${n} Fibonacci numbers: ${sequence.join(", ")}`; } function fibonacci(n) { if (n <= 0) { return []; } else if (n === 1) { return [0]; } else if (n === 2) { return [0, 1]; } const sequence = [0, 1]; for (let i = 2; i < n; i++) { const nextNumber = sequence[i - 1] + sequence[i - 2]; sequence.push(nextNumber); } return sequence; } </script> </body> </html>
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