Question

Using the switch statement, write a menu driven program to:
(i) To find and display all the factors of a number input by the user (including 1 and excluding number itself).

Example:
Sample Input: n=15
Sample Output: 1, 3, 5.
(ii) To 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.

Answer 1

import java.util.scanner;
class menu
{
        Public static void main ( )
        {
             scanner s=new scanner (System.in);
             System.out.println("1. factor of No.");
             System.out.println("2. factorial of No.");
             int ch=S.nextInt( );
             System.out.println ("Enter No");
             int n=S.nextInt( );
             switch (ch)
             {
                 case 1:
                 for (int i=1; i<=n-1; i++)
                 {
                       if(n%i==0)
                             System.out.print(i);
                 }
             break;
                 case 2:
                 int F=1;
                 for (int i=1; i<=n; i++)
                {
                          F=F*i;
                }
                System.out.println("Factorial is" +F);
             break;
default:
                System.out.println("Incorrect choice");
}
           }
                }