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Menu Driven - Composite Number / Smallest digit in Number Program - Java Programs

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 composite if it has one or more than one factor 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

Output: Smallest digit is 2.


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

Java 

 import java.util.Scanner;
class Menu{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("1. Composite number");
        System.out.println("2. Smallest digit");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            System.out.print("Number to be checked: ");
            int n = Integer.parseInt(in.nextLine());
            boolean flag = false;
            for(int i = 2; i <= n / 2; i++){
                if(n % 2 == 0){
                    flag = true;
                    break;
                }
            }
            if(flag)
                System.out.println("Composite number");
            else
                System.out.println("Not a Composite number");
            break;
        case 2:
            System.out.print("Enter the number: ");
            n = Integer.parseInt(in.nextLine());
            int d = n % 10;
            for(int i = n; i != 0; i /= 10){
                if(d > i % 10)
                    d = i % 10;
            }
            System.out.println("Smallest digit: " + d);
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. Composite number
2. Smallest digit
Enter your choice: 1
Number to be checked: 12
Composite number 

 OUTPUT 2: 
1. Composite number
2. Smallest digit
Enter your choice: 2
Enter the number: 6524
Smallest digit: 2
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