43 lines
1.0 KiB
Python
43 lines
1.0 KiB
Python
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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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