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GitHub Repository: jackfrued/Python-100-Days
 Path: blob/master/Day01-15/code/Day08/circle.py
Views: 729
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"""

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练习

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修一个游泳池 半径(以米为单位)在程序运行时输入 游泳池外修一条3米宽的过道

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过道的外侧修一圈围墙 已知过道的造价为25元每平米 围墙的造价为32.5元每米

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输出围墙和过道的总造价分别是多少钱(精确到小数点后2位)

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Version: 0.1

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Author: 骆昊

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Date: 2018-03-08

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"""

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import math

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class Circle(object):

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    def __init__(self, radius):

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        self._radius = radius

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    @property

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    def radius(self):

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        return self._radius

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    @radius.setter

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    def radius(self, radius):

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        self._radius = radius if radius > 0 else 0

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    @property

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    def perimeter(self):

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        return 2 * math.pi * self._radius

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    @property

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    def area(self):

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        return math.pi * self._radius * self._radius

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if __name__ == '__main__':  

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    radius = float(input('请输入游泳池的半径: '))

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    small = Circle(radius)

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    big = Circle(radius + 3)

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    print('围墙的造价为: ￥%.1f元' % (big.perimeter * 115))

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    print('过道的造价为: ￥%.1f元' % ((big.area - small.area) * 65))

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