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FactorialSeriesCalculation.java

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import java.util.*;

class Number {

int n;

public Number(int nn) {

n = nn;

}

public int factorial(int a) {

if (a <= 1)

return 1;

return a * factorial(--a);

}

public void display() {

System.out.println("Number:" + n);

}

}

class FactorialSeriesCalculation extends Number {

int sum;

public FactorialSeriesCalculation(int n) {

super(n);

sum = 0;

}

public void calcSum() {

for (int i = 1; i <= n; i++) {

sum += super.factorial(i);

}

}

public void display() {

super.display();

System.out.println("sum" + sum);

}

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("Enter the number: ");

int n0 = sc.nextInt();

FactorialSeriesCalculation ob = new FactorialSeriesCalculation(n0);

ob.calcSum();

ob.display();

}

}