Question

There are two parts to this activity. Before you write a Java program for this activity, write the pseudocode for this program. Turn in the pseudo code and Java program.

Create a program that prompts the user for an integer number. The program returns the factorial of the number. 0! = 1

In your program, answer the following question: What kind of loop are you using for this example? Counter-controlled loop or sentinel controlled loop? Explain.

Sample Input
Enter a number: 8

Sample Output
8! = 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 40320

Sample Input
Enter a number: 3

Sample Output
3! = 3 * 2 * 1 = 6

Sample Input
Enter a number: 10

Sample Output
10! = 10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 3628800

Sample Input
Enter a number: 0

Sample Output
0! = 1 

Sample Input
Enter a number: 5

Sample Output
5! = 5 * 4 * 3 * 2 * 1 = 120

Answer 1

Pseudocode

• ​​​​​​input the number
• fact =1
• for i as n-1 to 0, fact=fact*i
• print the resut using appropriate messages

Code

import java.util.Scanner;
public class fact {

  public static void main(String[] args)
   {
      int n;
      System.out.print("Enter a number: ");
      Scanner in = new Scanner(System.in);
      n =in.nextInt();
      System.out.print(n+"!=");
      int fact=1;
      for(int i=n;i>0;i--)
      { 
        if(i==n)
            System.out.print(n);
        else 
            System.out.print("*"+i);
        fact=fact*i;
        
      }
      if(n==0)
         System.out.print(fact);
      else 
         System.out.print("="+fact);
  }

}

Loop:

counter controlled loop is being used here. Counter controlled loop is nothing but number of iterations already known. here its obvious that the iteration have to done n times.If n is 7 iteration will occur 7 times.

Terminal work

.