编写一个控制台应用程序，定义和使用cylinder类，cylinder类的构造方法被传递了两个double值，分别表示圆柱体的半径和高度。用cylinder类计算圆柱体的体积，并存储在一个double变量中。在cylinder类中包含一个方法vol()，用来显示每个cylinder对象的体积。-Write a console application, the definition and use of cylinder type, cylinder class constructor method is passed two double values, respectively, of the cylinder radius and height. Class with a cylinder volume of a cylinder calculated and stored in a double variable. In the cylinder class contains a method vol (), is used to display the volume of the object for each cylinder.