已知圆半径r=2.5 圆柱高h=4,求圆的周长，面积，圆球体积，圆柱体积，用cin输入要计算的项目，然后输出计算结果，输入输出时要有文字提示-Known round cylinder radius r = 2.5 high h = 4, for the circumference of the circle, area, ball size, cylindrical volume, use cin input to calculate project, and then output the calculation results, the input to the output of the tooltip