package circumference;

import java.util.Scanner;

/**
 * Uses Java Math library
 * @author azmeer
 */
public class Circumference {

    public static void main(String[] args) {
        System.out.println("Calculate the circumference of a circle - with user input");
        Scanner in = new Scanner(System.in);
        int r;
        double c;
        
        System.out.print("What is the radius? ");
        r = in.nextInt();

        c = 2 * Math.PI  * r;
        System.out.println("pi=" + Math.PI);
        System.out.println("radius=" + r + " circumference=" + c);
    }
}

import java.util.Scanner;

/**
 * Using modulo operator
 * @author azmeer
 */
public class OddEven {

    public static void main(String[] args) {
        int n, x;
        System.out.println("Odd/Even detector");

        Scanner in = new Scanner(System.in);
        System.out.print("Please enter a number: ");
        n = in.nextInt();

        x = n % 2;

        if (x == 0) {
            System.out.println(n + " is an even number");
        } else {
            System.out.println(n + " is an odd number");
        }

    }
}

import java.util.Scanner;

/**
 * Calculate age with given year of birth value
 *
 * @author azmeer
 */
public class CalcAge {

    public static void main(String[] args) {
        System.out.println("Age Calculator");

        Scanner in = new Scanner(System.in);
        int age, yob;

        System.out.print("What is your year of birth? ");
        yob = in.nextInt();
        age = 2023 - yob;

        System.out.println("You are " + age + " years old");

        if (age < 18) {
            System.out.println("You are a child");
        } else {
            System.out.println("You are an adult");
        }

    }
}