Merge pull request #176 from Buddhimah/master

Java_Factorial_Program

Author: t2013anurag

factorial/Factorial.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+/**
+ * Created by buddhimah on 10/16/2017.
+ */
+public class Factorial {
+    public static  int fac(int number){
+        int r;
+        if(number == 1){
+            return 1;
+        }
+        r = fac(number - 1)*number;
+        return r;
+   }
+    public static void main(String args[]){
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter a number: ");
+        int num =sc.nextInt();
+        if(num < 0){
+            Error a = new Error("factorial for negative numbers is undefined");
+            System.out.println(a.getMessage());
+            Factorial.main(new String[1]);
+        }else {
+            System.out.println(fac(num));
+        }
+    }
+}