Sunday, January 27, 2019

Factorial of a given number using recursion.
public lass FactorialRecursion{
        public static void main(String[] ar){
             System.out.print("Enter a number : ");
             int n;
             Scanner sc=new Scanner(System.in);
             n=sc.nextInt();
             double ans=fact(n);
             System.out.println("The factorial of "+n+" = "+ans);
             sc.close();
        }

        public static double fact(int num){
               if(num==1){
                     return(1);
               }else{
                     return(num*(fact(num-1))); //Calling itself again with a different value.
                 }
        }
}

O/P: Enter a number : 5
The factorial of 5 = 120.0
with out recursion: 
public class Factorial {
       public static void main(String[] args) throws NumberFormatException, IOException  {
               BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
               System.out.println("Enter  the Number");
               int no=Integer.parseInt(br.readLine());
               int fact=1;
               for(int i=1;i<=no;i++){
                     fact=fact*i;
               }
               System.out.println("Factorial is: "+ fact);
       }


}

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