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Using switch statement, write a menu driven program to:

(a) find and display all the factors of a number input by the user ( including 1 and the excluding the number itself).

Example:

Sample Input : n = 15
Sample Output : 1, 3, 5

(b) find and display the factorial of a number input by the user (the factorial of a non-negative integer n, denoted by n!, is the product of all integers less than or equal to n.)

Example:

Sample Input : n = 5
Sample Output : 5! = 1*2*3*4*5 = 120

For an incorrect choice, an appropriate error message should be displayed.

Java

Java Iterative Stmts

ICSE 2015

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Answer

import java.util.Scanner;

public class KboatMenu
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Factors of number");
        System.out.println("2. Factorial of number");
        System.out.print("Enter your choice: ");
        int choice = in.nextInt();
        int num;

        switch (choice) {
            case 1:
            System.out.print("Enter number: ");
            num = in.nextInt();
            for (int i = 1; i < num; i++) {
                if (num % i == 0) {
                    System.out.print(i + " ");
                }
            }
            System.out.println();
            break;

            case 2:
            System.out.print("Enter number: ");
            num = in.nextInt();
            int f = 1;
            for (int i = 1; i <= num; i++)
                f *= i;
            System.out.println("Factorial = " + f);
            break;
            
            default:
            System.out.println("Incorrect Choice");
            break;
        }
    }
}

Variable Description Table

Program Explanation

Output

BlueJ output of Using switch statement, write a menu driven program to: (a) find and display all the factors of a number input by the user ( including 1 and the excluding the number itself). Example: Sample Input : n = 15 Sample Output : 1, 3, 5 (b) find and display the factorial of a number input by the user (the factorial of a non-negative integer n, denoted by n!, is the product of all integers less than or equal to n.) Example: Sample Input : n = 5 Sample Output : 5! = 1*2*3*4*5 = 120 For an incorrect choice, an appropriate error message should be displayed.BlueJ output of Using switch statement, write a menu driven program to: (a) find and display all the factors of a number input by the user ( including 1 and the excluding the number itself). Example: Sample Input : n = 15 Sample Output : 1, 3, 5 (b) find and display the factorial of a number input by the user (the factorial of a non-negative integer n, denoted by n!, is the product of all integers less than or equal to n.) Example: Sample Input : n = 5 Sample Output : 5! = 1*2*3*4*5 = 120 For an incorrect choice, an appropriate error message should be displayed.

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