import java.lang.Math;
import java.util.Scanner;
import java.util.regex.Pattern;

public class App {

    public static void main(String[] args) {
        //printCustomTextFiveTimes("I like to write Java code!");
        //System.out.println(sumTwoIntegerNumbers(75, 15));
        //greetMeWithTheName();
        //multiplyTwoIntegerNumbers();
        //computeAdvancedFormula();

        double value = 1f/3f;
        System.out.printf("%.2f", value);
        System.out.println();
        System.out.printf("%.3f", value);
    }

    //1
    public static void printCustomTextFiveTimes(String yourText) {
        int initialValue = 0;
        while (initialValue < 5) {
            System.out.println(yourText);
            initialValue++;
        }
    }

    //2
    public static int sumTwoIntegerNumbers(int firstNumber, int secondNumber) {
        return firstNumber + secondNumber;
    }

    //3
    public static void greetMeWithTheName() {
        // https://www.geeksforgeeks.org/ways-to-read-input-from-console-in-java/
        Scanner in = new Scanner(System.in);
        System.out.print("Enter your name: ");
        String userName = in.nextLine();
        if (iSStringContainsDigits(userName)) {
            System.out.println("Your name contains digits. Please to change it :)");
        } else {
            System.out.println("Nice to meet you, " + userName + "!");
        }
    }

    //4
    public static void multiplyTwoIntegerNumbers() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter your first number: ");
        int firstNumber = in.nextInt();
        System.out.print("Enter your second number: ");
        int secondNumber = in.nextInt();
        System.out.println("Result: " + firstNumber * secondNumber);
    }

    //5
    public static void computeAdvancedFormula() {
        System.out.println(4.0 * (1 - (1.0/3) + (1.0/5) - (1.0/7) + (1.0/9) - (1.0/11)));
    }

    //

    public static boolean iSStringContainsDigits(String yourText) {
        return Pattern.compile("[0-9]").matcher(yourText).find();
    }
}