Question

Using the switch statement, write a menu driven program:
(i) To check and display whether a number input by the user is
a composite number or not (A number is said to be a composite, if it
has one or more then one factors excluding 1 and the number itself).
Example: 4, 6, 8, 9…
(ii) To find the smallest digit of an integer that is input:
Sample input: 6524
Sample output: Smallest digit is 2
For an incorrect choice, an appropriate error message should be displayed.

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Code

				
					import java.util.Scanner;

public class program9
{

    public static void main(String[] args)
    {
        int number=0;
        Scanner sc = new Scanner(System.in);

        System.out.println("Press 1 to  Check composite number");
        System.out.println("Press 2 to  Find smallest digit of a number");
        System.out.print("Enter your choice: ");
        int choice = sc.nextInt();
        switch (choice)
        {
            case 1:
            System.out.print("Enter a number: ");
            number = sc.nextInt();
            int i=0;
            boolean IsComposite=false;
            for (i = 2; i < number; i++)
            {
                if (number % i == 0)
                {

                    IsComposite=true;
                    break;
                }
            }

            if(IsComposite==true)
            {
                System.out.println("It is a composite number");
            }
            else
            {
                System.out.println("It is not a composite number");
            }
            break;
            case 2:
            System.out.print("Enter a number: ");
            number = sc.nextInt();
            int smallest = 9,rem=0;
            while (number > 0)
            {
                rem = number % 10;
                if (rem < smallest)
                {
                    smallest = rem;
                }
                number = number / 10;
            }

            System.out.println("Smallest digit is " + smallest);
            break;
            default:
            System.out.println("Incorrect choice");
            break;
        }
    }
}