第二章第二题（计算圆柱体的体积）(Compute the volume of a cylinder)

• 2.2（计算圆柱体的体积）编写程序，读入圆柱体的半径和高，并使用下列公式计算圆柱的体积：
  面积 = 半径 × 半径 × π
  体积 = 面积 × 高
  下面是一个运行示例：
  Enter the radius and length of a cylinder:5.5 12
  The area is 95.0331
  The volume is 1140.4

  2.2(Compute the volume of a cylinder) Write a program that reads the radius and length of a cylinder and computes the area and volume using the following formulas:
  area = radius × radius × π
  volume = area × length
  Here is a simple run:
  Enter the radius and length of a cylinder:5.5 12
  The area is 95.0331
  The volume is 1140.4

• 参考代码：

package chapter02;

import java.util.*;

public class Code_02 {
    public static void main(String[] args) {
        double RadiusCylinder, LengthCylinder, AreaCylinder, VolumeCylinder;

        System.out.print("Enter the radius and length of a cylinder : ");
        Scanner R_L_input = new Scanner(System.in);

        RadiusCylinder = R_L_input.nextDouble();
        LengthCylinder = R_L_input.nextDouble();

        AreaCylinder = RadiusCylinder * RadiusCylinder * Math.PI;
        VolumeCylinder = AreaCylinder * LengthCylinder;

        System.out.println("The area is " + AreaCylinder);
        System.out.println("The volume is " + VolumeCylinder);

        R_L_input.close();
    }
}

• 结果显示：

Enter the radius and length of a cylinder : 5.5 18
The area is 95.03317777109125
The volume is 1710.5971998796424

Process finished with exit code 0

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