Question

a Java program for generating area of circle

Answer 1

import java.util.Scanner;
public class Area
{
public static void main(String[] args)
{
int r;
double pi = 3.14, area;
Scanner s = new Scanner(System.in);
System.out.print("Enter radius of circle:");
r = s.nextInt();
area = pi * r * r;
System.out.println("Area of circle:"+area);
}
}
Output:

$ javac Area.java
$ java Area
 
Enter radius of circle:5
Area of circle:78.5

Answer 2

$\Large{\sf{Java \: Program}}$

class Test

{

    static final double PI = Math.PI;

          

    static double findArea(int r)

    {

       return PI * Math.pow(r, 2);

    }

           

    // Driver method

    public static void main(String[] args) 

    {

        System.out.println("Area is " +  find Area(5));

    }

}