文件名称:areaofcircle
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一圆形游泳池如图所示，现在需在其周围建一圆形过道，并在其四周围上栅栏。
栅栏价格为35元/米，过道造价为20元/平方米。
过道宽度为3米，
游泳池半径由键盘输入。
要求编程计算并输出过道和栅栏的造价。-A circular pool as shown in figure, now in its built around to a circular corridor, and in its 4 around on the fence.
The fence for 35 yuan/m price, corridor cost for 20 yuan/square metre.
Aisle width is 3 meters,
The radius of the swimming pool by keyboard input.
Demand and output programming calculation of corridor and the cost of the fence.
栅栏价格为35元/米，过道造价为20元/平方米。
过道宽度为3米，
游泳池半径由键盘输入。
要求编程计算并输出过道和栅栏的造价。-A circular pool as shown in figure, now in its built around to a circular corridor, and in its 4 around on the fence.
The fence for 35 yuan/m price, corridor cost for 20 yuan/square metre.
Aisle width is 3 meters,
The radius of the swimming pool by keyboard input.
Demand and output programming calculation of corridor and the cost of the fence.
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areaofcircle.cpp