Question

Write a program in java to calculate and display the factorials of all the numbers between 'm' and 'n' (where m 0, n>0).

Answer 1

Answer:

import java.util.Scanner;

public class SumOfFactorial

{

public static void main(String[] args)

{

// create scanner class object.

Scanner sc = new Scanner(System.in);

// enter the number.

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

int n = sc.nextInt();

int total=0;

int i=1;

// calculate factorial here.

while(i <= n)

{

int factorial=1;

int j=1;

while(j <= i)

{

factorial=factorial*j;

j = j+1;

}

// calculate sum of factorial of the number.

total = total + factorial;

i=i+1;

}

// print the result here.

System.out.println("Sum : " + total);

}

}

Answer 2

Question:-

Write a program in Java to calculate and display the factorial of all the numbers between m and n.

Program:-

import java.util.*;

class Factorial

{

static long factorial(int n)

{

long f=1L;

int i=1;

while(i++<=n)

f*=i;

return f;

}

public static void main(String args[])

{

Scanner sc=new Scanner(System.in);

System.out.print("Enter the starting range: ");

int m=sc.nextInt();

System.out.print("Enter the ending range: ");

int n=sc.nextInt();

for(int i=m;i<=n;i++)

System.out.println("Factorial of "+i+" is: "+fact(i));

}

}