如何调用方法进行计算 [英] How to call a method for doing a calculation

问题描述

我想插入半径并将半径传递给calare mthod并获得结果并显示在区域中。



所有数据类型都是双倍的。 />


但这不起作用。



我尝试了什么：

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;
        
        }
    }
}

推荐答案

据我所知（at倾向于Java 7）Java不支持嵌套方法。所以你必须写一些类似的东西：

（请注意，入口点应声明为 main ，全部小写）

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)

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;

    }
}

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