Chapter1_Ex1

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

/*  ==================================================
        NoteBook chapter 1: Building stones's Language

                Ex1: Circle scope & Area
    ==================================================
*/
public class MyProgram {
    public static void main(String[] args) {

        //variables
        int radios;
        float scope,area;
        Scanner s=new Scanner(System.in);

        //user input
        System.out.println("Enter radios: ");
        radios=s.nextInt();

        scope= (float) (2*radios*Math.PI);      //scope: P=2*PI*R
        area= (float) (Math.PI * Math.pow(radios,2));      //area:  S= PI*R^2

        //two ways of printing
        System.out.println("radios: "+radios+"\tscope: "+scope+"\tarea: "+area);
        System.out.printf("radios: %d\tscope: %.2f\tarea: %.2f",radios,scope,area);
    }
}