Question

Please submit
1) the source code (.java file), and
2) the screenshot of running results of each question.

1. (Factorials) Write an application that calculates the factorial of 20, and display the results. Note: 1) The factorial of a positive integer n (written n!) is equal to the product of the positive integers from 1 to n. 2) Use type long.

2. (Largest and Smallest Integers) Write an application that reads five integers and determines and prints the largest and smallest integers in the group. Use for loop.

Answer 1

//import for Scanner
import java.util.Scanner;

//main class
class Main {
  //main method 
  public static void main(String arg[])
  {
    //declaration of number 
    long n,fact=1;
    
    //create scanner object
    Scanner sc = new Scanner(System.in);
    
    //take input from user
    System.out.println("Enter number :");
          n = sc.nextLong();
 
    //calculate factorial from number
          for(int i=1;i<=n;i++)
          {
      fact=fact*i;
    }
    
    //print factorial on console
    System.out.println("factorial = "+fact);
        }
}

output of above code

Largest and Smallest Integers

//import for Scanner
import java.util.Scanner;

//main class
class Main {
  //main method 
  public static void main(String arg[])
  {
    // declaring and creating array objects
    int[] arr = new int[5];
    int min=0, max=0, i=0;
    
    //create scanner object
    Scanner sc = new Scanner(System.in);
    //take input from user
    System.out.println("Enter five numbers :");
    for(i=0; i<arr.length; i++)
    {
      // read input
      arr[i] = sc.nextInt();
    }
          
    max=arr[0];
    min=arr[0];
    for(i =0; i<arr.length ; i++)
    if(arr[i]>max)
    {
      max=arr[i];
    }
    else if(arr[i]<min)
    {
      min=arr[i];
    }

   //print factorial on console
    System.out.println(" smallest integers = "+min);
    System.out.println(" largest integers = "+max);
        }
}

output: