Using the switch statement, write a menu driven program:

To check and display whether a number input by the user is a composite number or not.
A number is said to be composite, if it has one or more than one factors excluding 1 and the number itself.
Example: 4, 6, 8, 9...

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.

Java Programming Language (Article) (Program)

28

Program:

import java.util.Scanner;

public class RAnsariNumber
{
    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        System.out.println("Type 1 for Composite Number");
        System.out.println("Type 2 for Smallest Digit");
        System.out.print("Enter your choice: ");
        int ch = in.nextInt();

        switch (ch) {
            case 1:
            System.out.print("Enter Number: ");
            int n = in.nextInt();
            int c = 0;
            for (int i = 1; i <= n; i++) {
                if (n % i == 0)
                    c++;
            }

            if (c > 2)
                System.out.println("Composite Number");
            else
                System.out.println("Not a Composite Number");
            break;

            case 2:
            System.out.print("Enter Number: ");
            int num = in.nextInt();
            int s = 10;
            while (num != 0) {
                int d = num % 10;
                if (d < s)
                    s = d;
                num /= 10;
            }
            System.out.println("Smallest digit is " + s);
            break;

            default:
            System.out.println("Wrong choice");
        }
    }
}

Output:

Type 1 for Composite Number
Type 2 for Smallest Digit
Enter your choice: 1
Enter Number: 9
Composite Number
Press any key to continue . . .


Type 1 for Composite Number
Type 2 for Smallest Digit
Enter your choice: 2
Enter Number: 6524
Smallest digit is 2
Press any key to continue . . .

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