Answer to Question #289961 in Java | JSP | JSF for Dreaper

Question

Using the NetBeans IDE, create a new project

Name the class as FactorialCalculator

Write a simple factorial calculator program. The program should perform the following

step 1. Ask the user to enter a positive integer

step 2. Check if the entered integer is positive or negative. if it is positive, perform step 3; otherwise, display an appropriate error message and the program should stop.

step 3. Calculate the factorial of the entered positive integer and display the result.

Note: The factorial of n is denoted by n! and calculated by the product of integer numbers from 1 to n. For example, the entered integer is 5, the calculation of its factorial is: 5! = 1 x 2 x 3 x 4 x 5 = 120.

Step 4. Repeat Step 1 to Step 3 five(5) times

Answer 1

import java.util.*;


public class FactorialCalculator {


	/**
	 * The start point of the program
	 * 
	 * @param args
	 * 
	 */
	public static void main(String[] args) {
		Scanner keyBoard = new Scanner(System.in);


		for (int i = 0; i < 5; i++) {
			// step 1. Ask the user to enter a positive integer
			System.out.print("Enter a positive integer: ");
			int positiveInteger = keyBoard.nextInt();
			// step 2. Check if the entered integer is positive or negative. if it is
			// positive, perform step 3;
			// otherwise, display an appropriate error message and the program should stop.
			if (positiveInteger > 0) {
				// step 3. Calculate the factorial of the entered positive integer and display
				// the result.
				// Note: The factorial of n is denoted by n! and calculated by the product of
				// integer numbers from 1 to n.
				// For example, the entered integer is 5, the calculation of its factorial is:
				// 5! = 1 x 2 x 3 x 4 x 5 = 120.
				int fact = 1;
				for (int j = 1; j <= positiveInteger; j++) {
					fact = fact * j;
				}
				System.out.println("The factorial of "+positiveInteger+": "+fact);
				
			}else {
				System.out.println("The input value is not positive.");
				break;
			}
		}// Step 4. Repeat Step 1 to Step 3 five(5) times


		


		keyBoard.close();
	}


}