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JAVA program to Calculate Factorial using Function Interface (involve lambdas )

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import java.util.Scanner;
import java.util.function.Function;

public class fact {


    public static void main(String[] args) {


        Function<Integer ,String > fact=(n)->
        {String res="Factorial of "+n+" is=";
       double  a=1;
        for (int i=1;i<=n;i++)
            a*=i;
          return res+a;
        };

        Scanner in=new Scanner(System.in);
        System.out.print("Enter the number :");
        int num=in.nextInt();
        System.out.println(fact.apply(num));

    }
}

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