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- """
- 练习
- 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
- 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
- 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)
- Version: 0.1
- Author: 骆昊
- Date: 2018-03-08
- """
- import math
- class Circle(object):
- def __init__(self, radius):
- self._radius = radius
- @property
- def radius(self):
- return self._radius
- @radius.setter
- def radius(self, radius):
- self._radius = radius if radius > 0 else 0
- @property
- def perimeter(self):
- return 2 * math.pi * self._radius
- @property
- def area(self):
- return math.pi * self._radius * self._radius
- if __name__ == '__main__':
- radius = float(input('请输入游泳池的半径: '))
- small = Circle(radius)
- big = Circle(radius + 3)
- print('围墙的造价为: ￥%.1f元' % (big.perimeter * 115))
- print('过道的造价为: ￥%.1f元' % ((big.area - small.area) * 65))
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