5 files changed, 126 insertions, 0 deletions
diff --git a/Lab04/fact/README.md b/Lab04/fact/README.md
new file mode 100644
index 0000000..6451270
--- /dev/null
+++ b/Lab04/fact/README.md
@@ -0,0 +1,11 @@
+# Lab04 - Factorial Calculator
+
+This directory contains files for a simple web application that calculates the factorial of a non-negative integer entered by the user using Javascript and displays using `innerText`.
+
+## Description
+
+Factorial is a mathematical operation that involves the multiplication of a positive integer with all the smaller positive integers leading up to it. This web application allows users to input a number, and it will calculate and display the factorial of that number.
+
+## Brief Look
+
+![Factorial Calculator Screenshot](screenshot.png)
diff --git a/Lab04/fact/index.html b/Lab04/fact/index.html
new file mode 100644
index 0000000..a6f7456
--- /dev/null
+++ b/Lab04/fact/index.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-7">
+    <meta name="viewport" content="width=device-width, initial-scale=2.0">
+    <link rel="stylesheet" href="style.css">
+    <title>Factorial Calculator</title>
+</head>
+<body>
+    <h1> Factorial </h1>
+    <p>Factorial is a mathematical operation that involves the multiplication of a positive integer with all the smaller positive integers leading up to it. <br>It is denoted by the symbol "!" following a number. <br> For instance, the factorial of 5 (written as 5!) equals the product of 5 × 4 × 3 × 2 × 1, resulting in 120. </p>
+    <div>
+    <label for="numberInput">Enter a number:</label>
+    <input type="number" id="numberInput">
+    </div>
+    <button type="submit" id="submitbutton">Submit</button>
+    <p id="result"></p>
+    <script>
+    function factorial(n) {
+        if (n==0){
+            return 1;
+        }
+        return n*factorial(n-1);
+    }
+    const button = document.getElementById("submitbutton")
+    button.addEventListener("click", function() {
+        const input = document.getElementById("numberInput").value;
+        const result = factorial(input)
+        document.getElementById("result").innerText=`The factorial of ${input} is equal to ${result}`;
+    });
+    </script>
+</body>
+</html>
diff --git a/Lab04/fact/screenshot.png b/Lab04/fact/screenshot.png
new file mode 100644
index 0000000..00a1ec0
--- /dev/null
+++ b/Lab04/fact/screenshot.png
diff --git a/Lab04/fact/script.js b/Lab04/fact/script.js
new file mode 100644
index 0000000..a8f397e
--- /dev/null
+++ b/Lab04/fact/script.js
@@ -0,0 +1,23 @@
+function factorial(n) {
+    if (n === 0) {
+        return 1;
+    }
+    return n * factorial(n - 1);
+}
+
+document.addEventListener("DOMContentLoaded", function () {
+    const button = document.getElementById("submitbutton");
+    const resultElement = document.getElementById("result");
+    const numberInput = document.getElementById("numberInput");
+
+    button.addEventListener("click", function () {
+        const input = parseInt(numberInput.value);
+
+        if (!isNaN(input) && input >= 0) {
+            const result = factorial(input);
+            resultElement.innerText = `The factorial of ${input} is equal to ${result}`;
+        } else {
+            resultElement.innerText = "Please enter a non-negative number.";
+        }
+    });
+});
diff --git a/Lab04/fact/style.css b/Lab04/fact/style.css
new file mode 100644
index 0000000..b0452b7
--- /dev/null
+++ b/Lab04/fact/style.css
@@ -0,0 +1,59 @@
+body, h1, p, div {
+    margin: 0;
+    padding: 0;
+}
+
+/* Apply some basic styles */
+body {
+    font-family: Arial, sans-serif;
+    background-color: #f0f0f0;
+    text-align: center;
+    padding: 20px;
+}
+
+h1 {
+    color: #333;
+    font-size: 24px;
+    margin-bottom: 10px;
+}
+
+p {
+    color: #666;
+    font-size: 16px;
+    line-height: 1.4;
+    margin-bottom: 20px;
+}
+
+div {
+    margin-bottom: 20px;
+}
+
+label {
+    font-weight: bold;
+}
+
+input[type="number"] {
+    width: 30%;
+    padding: 5px;
+    border: 1px solid #ccc;
+    border-radius: 5px;
+}
+
+button {
+    padding: 10px 20px;
+    background-color: #007bff;
+    color: #fff;
+    border: none;
+    border-radius: 5px;
+    cursor: pointer;
+}
+
+button:hover {
+    background-color: #0056b3;
+}
+
+#result {
+    font-weight: bold;
+    color: #333;
+    font-size: 18px;
+}