Merge pull request #51 from IamBisrutPyne/IamBisrutPyne-factorial-kotlin

Update factorial.kt

Author: IamBisrutPyne

snippets/Basics/kotlin/factorial.kt

@@ -1,6 +1,36 @@
-# Title: Iterative factorial
-# Topic: Basics
-# Language: kotlin
-# Example: see bottom
+// Metadata Header (MANDATORY)
+// -----------------------------
+// Program Title: Factorial Calculation (Iterative)
+// Author: IamBisrutPyne
+// Date: 2025-10-10
+//
+// Description: Computes the factorial of a non-negative integer using an iterative approach.
+//
+// Language: Kotlin
+//
+// Time Complexity: O(n)
+// Space Complexity: O(1)
+// -----------------------------
 
-// Iterative factorial - placeholder in kotlin
+/**
+ * Calculates the factorial of a non-negative integer.
+ * @param n The number to calculate the factorial of.
+ * @return The factorial result.
+ */
+fun factorial(n: Int): Long {
+    // Use Long to handle larger results safely
+    if (n < 0) {
+        return 0
+    }
+    var result: Long = 1
+    for (i in 2..n) {
+        result *= i
+    }
+    return result
+}
+
+fun main() {
+    val num = 10
+    println("Factorial of $num is: ${factorial(num)}")
+    // Output: Factorial of 10 is: 3628800
+}