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<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Add Leading Zero to Single Digit</title> <script> function addLeadingZero(num) { var strNum = num.toString(); if (strNum.length === 1) { strNum = "0" + strNum; } return strNum; } function testAddLeadingZero() { var inputNumber = document.getElementById('inputNumber').value; var result = addLeadingZero(inputNumber); document.getElementById('result').innerText = "Result: " + result; } </script> </head> <body> <h1>Javascript Add Leading Zero to Single Digit</h1> <label for="inputNumber">Enter a number:</label> <input type="number" value='3' id="inputNumber" name="inputNumber"> <button onclick="testAddLeadingZero()">Add Leading Zero</button> <p id="result"></p> </body> </html>