Day17面向对象作业

1. 定义一个矩形类，拥有属性：长、宽 拥有方法：求周长、求面积

   class Rectangle:
       def __init__(self, length, width):
           self.length = length
           self.width = width
   
       def perimeter(self):
           return (self.length + self.width) * 2
   
       def area(self):
           return self.length * self.width
   
   
   a1 = Rectangle(10, 20)
   print('周长', a1.perimeter())
   print('面积', a1.area())
              

2. 定义一个二维点类，拥有属性：x坐标、y坐标 拥有方法：求当前点到另外一个点的距离

   class Point:
       def __init__(self, x, y):
           self.x = x
           self.y = y
   
       def length(self, other):
           return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** (0.5)
   
   
   p1 = Point(4, 5)
   p2 = Point(1, 1)
   print(p1.length(p2))
              

3. 定义一个圆类，拥有属性：半径、圆心 拥有方法：求圆的周长和面积、判断当前圆和另一个圆是否外切

   class Circle:
       def __init__(self, r, center=Point(0, 0)):
           self.r = r
           self.center = center
   
       def is_exterior_contact(self, other):
           return self.r + other.r == self.center.length(other.center)
   
   
   c1 = Circle(10)
   c2 = Circle(20, Point(30, 0))
   result = c1.is_exterior_contact(c2)
   print(result)
              

4. 定义一个线段类，拥有属性：起点和终点， 拥有方法：获取线段的长度

   class Line:
       def __init__(self, x, y):
           self.x = x
           self.y = y
   
       def length(self, other):
           return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** 0.5
   
   
   a1 = Line(0, 0)
   a2 = Line(3, 4)
   print('线段的长度：', a1.length(a2))
              

5. 定义一个狗类和一个人类：

   狗拥有属性：姓名、性别和品种 拥有方法：叫唤

   人类拥有属性：姓名、年龄、狗 拥有方法：遛狗

   class Dog:
       def __init__(self, name, gender, breed):
        self.name = name
           self.gender = gender
           self.breed = breed
   
       def cry(self):
           return f'名叫{self.name}的会汪汪汪的{self.gender}{self.breed}'
   
   
   d1 = Dog('旺财', '公狗', '哈士奇')
   d1.cry()
   
   
   class Mankind:
       def __init__(self, name, age, dog):
           self.name = name
           self.age = age
           self.dog = dog
   
       def walkDog(self):
           return f'{self.age}岁的{self.name}在溜' + self.dog.cry()
   
   
   p1 = Mankind('小李', 18, d1)
   print(p1.walkDog())