Example: Check Value is Integer or Not in Java using While loop

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// Check Value is Integer or Not in Java using While loop
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        String random_number;
        int f = 0, i = 0;

        System.out.print("Enter the number to check itself: ");
        random_number = in.nextLine();

        while (random_number.charAt(i) != '\0' && i < (random_number.length() - 1)) {
            if (random_number.charAt(i) == '.') {
                f = 1;
                break;
            }
            i++;
        }

        if (f == 1)
            System.out.println("\n" + random_number + " is a floating-point number.");
        else
            System.out.println("\n" + random_number + " is an integer number.");
    }
}