day15-面向对象作业

1. 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 bark(self):
           print('叫唤')
   
   
   class Person:
       def __init__(self, name, age, dog):
           self.name = name
           self.age = age
           self.dog = dog
   
       def walk_dog(self):
           print('正在遛狗')
   
   
   dog1 = Dog('旺财', '公狗', '金毛')
   p1 = Person('李华', '15', dog1)
   print(p1.walk_dog(), dog1.bark())
   

2. 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, weight, height):
           self.weight = weight
           self.height = height
   
       def area(self):
           return self.weight * self.height
   
       def zhouchang(self):
           return (self.weight + self.height) * 2
   
   
   rec1 = Rectangle(4, 5)
   print(rec1.area())
   print(rec1.zhouchang())
   

3. 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 get_juli(self, p2):
           return ((self.x - p2.x) ** 2 + (self.y - p2.y) ** 2) ** 0.5
   
   
   p1 = Point(4, 4)
   p2 = Point(-1, 3)
   print(p1.get_juli(p2))
   

4. 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:
       pi = 3.14
   
       def __init__(self, r, center):
           self.r = r
           self.center = center
   
       def get_zhouchang(self):
           return self.r * 2 * Circle.pi
   
       def get_area(self):
           return self.r ** 2 * Circle.pi
   
       def is_waiqie(self, c2):
           return self.r + c2.r == ((self.center[0] - c2.center[0]) ** 2 + (self.center[1] - c2.center[1]) ** 2) ** 0.5
   
   
   c1 = Circle(3, (0, 0))
   c2 = Circle(2, (5, 0))
   print(c1.get_area())
   print(c1.get_zhouchang())
   print(c1.is_waiqie(c2))
   

5. 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 Segment:
       def __init__(self, p1, p2):
           self.p1 = p1
           self.p2 = p2
   
       def get_length(self):
           return ((self.p1[0] - self.p2[0]) ** 2 + (self.p1[1] - self.p2[1]) ** 2) ** 0.5
   
   
   line1 = Segment((0, 0), (0, 7))
   print(line1.get_length())