How to call a method for doing a calculation

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I want to insert the radius and pass the radius to calare mthod and get the result and display in area.

All the data types are double.

But this is not working.

What I have tried:

//Calling Methods
package javalearning;

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


public class CallingMethods {
    
    public static void Main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        
        //double PI = Math.PI;
        //double radius;
        //double area;
        double diameter;
        
        System.out.print("Enter the radius :");
        
        double radius=input.nextDouble();
        
        double area=calarea(radius);
        
        System.out.print("The are of the circle is");
        
        public double calarea(double radiusC)
        {
        double CArea;
        CArea=PI*radiusC*radiusC;
        return CArea;
        
        }
    }
}

Posted 5-Apr-17 19:26pm

Member 13049972

Updated 5-Apr-17 21:30pm

v2

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CPallini · Accepted Answer · 2017-04-05T21:30:00

As far as I know (at leant till Java 7) Java doesn't support nested methods. So you have to write something like:
(please note the entry point should be declared as main, all lowercase)

Java

public class CallingMethods {

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

        double diameter;

        System.out.print("Enter the radius :");

        double radius=input.nextDouble();

        double area=calarea(radius);

        System.out.println("The are of the circle is " + area);

    }

    public static double calarea(double radiusC)
    {
      double CArea;
      CArea=PI*radiusC*radiusC;
      return CArea;

    }
}