First Factorial

ardallie · ardallie · commit 91dfe6741f03 · 2021-08-12T19:51:01.000+01:00
diff --git a/src/easy/FirstFactorial.java b/src/easy/FirstFactorial.java
@@ -0,0 +1,39 @@
+package easy;
+
+/**
+ * Have the function FirstFactorial(num) take
+ * the num parameter being passed and return the factorial of it.
+ * For example: if num = 4, then your program
+ * should return (4 * 3 * 2 * 1) = 24.
+ * For the test cases, the range will be between 1 and 18
+ * and the input will always be an integer.
+ */
+public class FirstFactorial {
+
+  /**
+   * First Factorial function.
+   *
+   * @param num input number
+   * @return facorial of the given number
+   */
+  private static int firstFactorial(int num) {
+    if (num == 0) {
+      return 1;
+    } else {
+      return num * firstFactorial(num - 1);
+    }
+  }
+
+  /**
+   * Entry point.
+   *
+   * @param args command line arguments
+   */
+  public static void main(String[] args) {
+    var result1 = firstFactorial(4);
+    System.out.println(result1);
+    var result2 = firstFactorial(8);
+    System.out.println(result2);
+  }
+
+}
